diff --git a/main.js b/main.js
index e9444720..88b621da 100644
--- a/main.js
+++ b/main.js
@@ -144,7 +144,7 @@ let seed, mapHistory = [], elSelected, modules = {}, notes = [];
 let customization = 0; // 0 - no; 1 = heightmap draw; 2 - states draw; 3 - add state/burg; 4 - cultures draw
 let mapCoordinates = {}; // map coordinates on globe
 let winds = [225, 45, 225, 315, 135, 315]; // default wind directions
-let biomesData = applyDefaultBiomesSystem();
+applyDefaultBiomesSystem();
 let nameBases = Names.getNameBases(); // cultures-related data
 const fonts = ["Almendra+SC", "Georgia", "Arial", "Times+New+Roman", "Comic+Sans+MS", "Lucida+Sans+Unicode", "Courier+New"]; // default web-safe fonts
 
@@ -328,7 +328,7 @@ function findBurgForMFCG(params) {
 
 // apply default biomes data
 function applyDefaultBiomesSystem() {
-  const biomeList = [
+  pack.biomes = [
     new Biome ("Marine", "#53679f", 0, new Icons({}, 0), 10),
     new Biome ("Hot desert", "#fbe79f", 2, new Icons({dune:3, cactus:6, deadTree:1}, 3), 200),
     new Biome ("Cold desert", "#b5b887", 5, new Icons({dune:9, deadTree:1}, 2), 150),
@@ -345,13 +345,13 @@ function applyDefaultBiomesSystem() {
   ];
 
   //it is occasionally useful to have the "ID" be in the object
-  biomeList.forEach((e, i) => {e.id = i;});
+  pack.biomes.forEach((e, i) => {e.id = i;});
 
   const MARINE = 0;
   const PERMAFROST = 11;
   const WETLANDS = 12;
 
-  const biomesMartix = [
+  pack.biomesMartix = [
     // hot ↔ cold; dry ↕ wet
     new Uint8Array([1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2]),
     new Uint8Array([3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,9,9,9,9,9,10,10]),
@@ -359,8 +359,6 @@ function applyDefaultBiomesSystem() {
     new Uint8Array([5,6,6,6,6,6,6,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,10,10,10]),
     new Uint8Array([7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,10,10,10])
   ];
-
-  return {biomeList, biomesMartix};
 }
 
 function showWelcomeMessage() {
@@ -1145,7 +1143,7 @@ function getBiomeId(moisture, temperature, height) {
   if (moisture > 40 && height < 25 || moisture > 24 && height > 24) return 12; // wetland biome
   const m = Math.min(moisture / 5 | 0, 4); // moisture band from 0 to 4
   const t = Math.min(Math.max(20 - temperature, 0), 25); // temparature band from 0 to 25
-  return biomesData.biomesMartix[m][t];
+  return pack.biomesMartix[m][t];
 }
 
 // assess cells suitability to calculate population and rand cells for culture center and burgs placement
@@ -1159,7 +1157,7 @@ function rankCells() {
   const areaMean = d3.mean(cells.area); // to adjust population by cell area
 
   for (const i of cells.i) {
-    let s = +biomesData.biomeList[cells.biome[i]].habitability; // base suitability derived from biome habitability
+    let s = +pack.biomes[cells.biome[i]].habitability; // base suitability derived from biome habitability
     if (!s) continue; // uninhabitable biomes has 0 suitability
     s += normalize(cells.fl[i] + cells.conf[i], flMean, flMax) * 250; // big rivers and confluences are valued
     s -= (cells.h[i] - 50) / 5; // low elevation is valued, high is not;
diff --git a/modules/burgs-and-states.js b/modules/burgs-and-states.js
index 79997ea5..c2ba3b80 100644
--- a/modules/burgs-and-states.js
+++ b/modules/burgs-and-states.js
@@ -292,7 +292,7 @@
     burgs.filter(b => b.i && !b.removed).forEach(b => b.state = cells.state[b.cell]); // assign state to burgs
 
     function getBiomeCost(b, biome, type) {
-      const bio = biomesData.biomeList[biome];
+      const bio = pack.biomes[biome];
       if (b === biome) return 10; // tiny penalty for native biome
       if (type === "Hunting") return bio.cost * 2; // non-native biome penalty for hunters
       if (type === "Nomadic" && biome > 4 && biome < 10) return bio.cost * 3; // forest biome penalty for nomads
diff --git a/modules/cultures-generator.js b/modules/cultures-generator.js
index fe6c43f1..90c82ebb 100644
--- a/modules/cultures-generator.js
+++ b/modules/cultures-generator.js
@@ -391,7 +391,7 @@
   }
 
   function getBiomeCost(c, biome, type) {
-    const b = biomesData.biomeList[biome];
+    const b = pack.biomes[biome];
     if (cells.biome[pack.cultures[c].center] === biome) return 10; // tiny penalty for native biome
     if (type === "Hunting") return b.cost * 5; // non-native biome penalty for hunters
     if (type === "Nomadic" && biome > 4 && biome < 10) return b.cost * 10; // forest biome penalty for nomads
diff --git a/modules/relief-icons.js b/modules/relief-icons.js
index 50e4fc62..ecf19a04 100644
--- a/modules/relief-icons.js
+++ b/modules/relief-icons.js
@@ -17,7 +17,7 @@
       const height = cells.h[i];
       if (height < 20) continue; // no icons on water
       if (cells.r[i]) continue; // no icons on rivers 
-      const b = biomesData.biomeList[cells.biome[i]];
+      const b = pack.biomes[cells.biome[i]];
       if (height < 50 && b.icons.density === 0) continue; // no icons for this biome
       const polygon = getPackPolygon(i);
       const x = d3.extent(polygon, p => p[0]), y = d3.extent(polygon, p => p[1]);
diff --git a/modules/religions-generator.js b/modules/religions-generator.js
index 66c2d559..e545c27c 100644
--- a/modules/religions-generator.js
+++ b/modules/religions-generator.js
@@ -212,7 +212,7 @@
 
         const cultureCost = c !== cells.culture[e] ? 10 : 0;
         const stateCost = s !== cells.state[e] ? 10 : 0;
-        const biomeCost = cells.road[e] ? 1 : biomesData.biomeList[cells.biome[e]].cost;
+        const biomeCost = cells.road[e] ? 1 : pack.biomes[cells.biome[e]].cost;
         const populationCost = Math.max(rn(popCost - cells.pop[e]), 0);
         const heightCost = Math.max(cells.h[e], 20) - 20;
         const waterCost = cells.h[e] < 20 ? cells.road[e] ? 50 : 1000 : 0;
@@ -248,7 +248,7 @@
 
       cells.c[n].forEach(function(e) {
         const religionCost = cells.religion[e] === b ? 0 : 2000;
-        const biomeCost = cells.road[e] ? 0 : biomesData.biomeList[cells.biome[e]].cost;
+        const biomeCost = cells.road[e] ? 0 : pack.biomes[cells.biome[e]].cost;
         const heightCost = Math.max(cells.h[e], 20) - 20;
         const waterCost = cells.h[e] < 20 ? cells.road[e] ? 50 : 1000 : 0;
         const totalCost = p + (religionCost + biomeCost + heightCost + waterCost) / Math.max(religions[r].expansionism, .1);
diff --git a/modules/routes-generator.js b/modules/routes-generator.js
index 8657ef13..f9bb199b 100644
--- a/modules/routes-generator.js
+++ b/modules/routes-generator.js
@@ -173,7 +173,7 @@
       for (const c of cells.c[n]) {
         if (cells.h[c] < 20) continue; // ignore water cells
         const stateChangeCost = cells.state && cells.state[c] !== cells.state[n] ? 400 : 0; // trails tend to lay within the same state
-        const habitedCost = Math.max(100 - biomesData.biomeList[cells.biome[c]].habitability, 0); // routes tend to lay within populated areas
+        const habitedCost = Math.max(100 - pack.biomes[cells.biome[c]].habitability, 0); // routes tend to lay within populated areas
         const heightChangeCost = Math.abs(cells.h[c] - cells.h[n]) * 10; // routes tend to avoid elevation changes
         const cellCoast = 10 + stateChangeCost + habitedCost + heightChangeCost;
         const totalCost = p + (cells.road[c] || cells.burg[c] ? cellCoast / 3 : cellCoast);
diff --git a/modules/save-and-load.js b/modules/save-and-load.js
index f464a02b..adc26dfa 100644
--- a/modules/save-and-load.js
+++ b/modules/save-and-load.js
@@ -231,7 +231,7 @@ function getMapData() {
       temperaturePoleOutput.value, precOutput.value, JSON.stringify(winds),
       mapName.value].join("|");
     const coords = JSON.stringify(mapCoordinates);
-    const b = biomesData.biomeList
+    const b = pack.biomes
     const biomes = [b.map(i => i.color), b.map(i => i.habitability), b.map(i => i.name)].join("|");
     const notesData = JSON.stringify(notes);
 
@@ -588,8 +588,8 @@ function parseLoadedData(data) {
       const habitabilityList = biomes[1].split(",").map(h => +h);
       const namesList = biomes[2].split(",");
 
-      biomesData = applyDefaultBiomesSystem();
-      const initialBiomes = biomesData.biomeList.length;
+      applyDefaultBiomesSystem();
+      const initialBiomes = pack.biomes.length;
 
       for (let i = 0; i < namesList.length; i++){
         const name = namesList[i];
@@ -597,13 +597,13 @@ function parseLoadedData(data) {
         const habitability = habitabilityList[i];
         let icons;
         if (i < initialBiomes){
-          biomesData.biomeList[i].name = namesList[i];
-          biomesData.biomeList[i].color = colorsList[i];
-          biomesData.biomeList[i].habitability = habitabilityList[i];
+          pack.biomes[i].name = namesList[i];
+          pack.biomes[i].color = colorsList[i];
+          pack.biomes[i].habitability = habitabilityList[i];
         }
         else{
-          biomesData.biomeList.push(new Biome(name, color, habitability));
-          biomesData.biomeList[i].id = i; //don't forget the id!
+          pack.biomes.push(new Biome(name, color, habitability));
+          pack.biomes[i].id = i; //don't forget the id!
         }
       }
     }()
@@ -822,7 +822,8 @@ function parseLoadedData(data) {
         });
 
         // 1.0 added new biome - Wetland
-        biomesData.biomeList.push("Wetland", "#0b9131", 12);
+        pack.biomes.push(new Biome("Wetland", "#0b9131", 12, new Icons({swamp:1}, 150), 150));
+        pack.biomes[12].id = 12;
       }
 
       if (version < 1.1) {
diff --git a/modules/ui/biomes-editor.js b/modules/ui/biomes-editor.js
index 3a484ecd..0e8db11a 100644
--- a/modules/ui/biomes-editor.js
+++ b/modules/ui/biomes-editor.js
@@ -55,19 +55,19 @@ function editBiomes() {
   function biomesCollectStatistics() {
     const cells = pack.cells;
 
-    biomesData.biomeList.forEach((biome) => {
+    pack.biomes.forEach((biome) => {
       biome.resetStatistics();
     });
 
     for (const i of cells.i) {
       if (cells.h[i] < 20) continue;
-      biomesData.biomeList[cells.biome[i]].addCell(i, cells);
+      pack.biomes[cells.biome[i]].addCell(i, cells);
     }
   }
 
   function biomesEditorAddLines() {
     const unit = areaUnit.value === "square" ? " " + distanceUnitInput.value + "²" : " " + areaUnit.value;
-    const l = biomesData.biomeList;
+    const l = pack.biomes;
     let lines = "", totalArea = 0, totalPopulation = 0;;
 
     for (const b of l) {
@@ -117,19 +117,19 @@ function editBiomes() {
 
   function biomeHighlightOn(event) {
     if (customization === 6) return;
-    const biome = biomesData.biomeList[+event.target.dataset.id];
+    const biome = pack.biomes[+event.target.dataset.id];
     biomes.select("#biome"+biome.id).raise().transition(animate).attr("stroke-width", 2).attr("stroke", "#cd4c11");
   }
 
   function biomeHighlightOff(event) {
     if (customization === 6) return;
-    const biome = biomesData.biomeList[+event.target.dataset.id];
+    const biome = pack.biomes[+event.target.dataset.id];
     biomes.select("#biome"+biome.id).transition().attr("stroke-width", .7).attr("stroke", biome.color);
   }
   
   function biomeChangeColor(el) {
     const currentFill = el.getAttribute("fill");
-    const biome = biomesData.biomeList[+el.parentNode.parentNode.dataset.id];
+    const biome = pack.biomes[+el.parentNode.parentNode.dataset.id];
 
     const callback = function(fill) {
       el.setAttribute("fill", fill);
@@ -141,13 +141,13 @@ function editBiomes() {
   }
   
   function biomeChangeName(el) {
-    const biome = biomesData.biomeList[+el.parentNode.dataset.id];
+    const biome = pack.biomes[+el.parentNode.dataset.id];
     el.parentNode.dataset.name = el.value;
     biome.name = el.value;
   }
 
   function biomeChangeHabitability(el) {
-    const biome = biomesData.biomeList[+el.parentNode.dataset.id];
+    const biome = pack.biomes[+el.parentNode.dataset.id];
     const failed = isNaN(+el.value) || +el.value < 0 || +el.value > 9999;
     if (failed) {
       el.value = biome.habitability;
@@ -184,8 +184,7 @@ function editBiomes() {
 
   function toggleLegend() {
     if (legend.selectAll("*").size()) {clearLegend(); return;}; // hide legend
-    const d = biomesData;
-    const data = Array.from(d.biomeList)  //shallow copy existing array
+    const data = pack.biomes              //shallow copy existing array
       .filter(i => i.cells)               //remove biomes with 0 cells
       .sort((a, b) => b.area - a.area)    //sort by size
       .map(i => [i.id, i.color, i.name]); //return index, color, and name
@@ -211,7 +210,7 @@ function editBiomes() {
   }
 
   function addCustomBiome() {
-    const b = biomesData.biomeList, i = b.length;
+    const b = pack.biomes, i = b.length;
     b.push(new Biome("Custom", getRandomColor(), 50))
     b[i].id = i; //don't forget the ID!
 
@@ -236,7 +235,7 @@ function editBiomes() {
   }
 
   function removeCustomBiome(el) {
-    const biome = biomesData.biomeList[+el.parentNode.dataset.id];
+    const biome = pack.biomes[+el.parentNode.dataset.id];
     el.parentNode.remove();
     biome.name = "removed";
     biomesFooterBiomes.innerHTML = +biomesFooterBiomes.innerHTML - 1;
@@ -323,7 +322,7 @@ function editBiomes() {
     const temp = biomes.select("#temp");
     const selected = body.querySelector("div.selected");
 
-    const biomeNew = biomesData.biomeList[+selected.dataset.id];
+    const biomeNew = pack.biomes[+selected.dataset.id];
     const color = biomeNew.color;
 
     selection.forEach(function(i) {
@@ -379,7 +378,7 @@ function editBiomes() {
   }
   
   function restoreInitialBiomes() {
-    biomesData = applyDefaultBiomesSystem();
+    applyDefaultBiomesSystem();
     defineBiomes();
     drawBiomes();
     recalculatePopulation();
diff --git a/modules/ui/general.js b/modules/ui/general.js
index 61714fe4..c62681a3 100644
--- a/modules/ui/general.js
+++ b/modules/ui/general.js
@@ -104,7 +104,7 @@ function showMapTooltip(point, e, i, g) {
   if (layerIsOn("togglePrec") && land) tip("Annual Precipitation: "+ getFriendlyPrecipitation(i)); else
   if (layerIsOn("togglePopulation")) tip(getPopulationTip(i)); else
   if (layerIsOn("toggleTemp")) tip("Temperature: " + convertTemperature(grid.cells.temp[g])); else
-  if (layerIsOn("toggleBiomes") && pack.cells.biome[i]) tip("Biome: " + biomesData.biomeList[pack.cells.biome[i]].name); else
+  if (layerIsOn("toggleBiomes") && pack.cells.biome[i]) tip("Biome: " + pack.biomes[pack.cells.biome[i]].name); else
   if (layerIsOn("toggleReligions") && pack.cells.religion[i]) {
     const religion = pack.religions[pack.cells.religion[i]];
     const type = religion.type === "Cult" || religion.type == "Heresy" ? religion.type : religion.type + " religion";
@@ -146,7 +146,7 @@ function updateCellInfo(point, i, g) {
   infoBurg.innerHTML = cells.burg[i] ? pack.burgs[cells.burg[i]].name + " (" + cells.burg[i] + ")" : "no";
   const f = cells.f[i];
   infoFeature.innerHTML = f ? pack.features[f].group + " (" + f + ")" : "n/a";
-  infoBiome.innerHTML = biomesData.biomeList[cells.biome[i]].name;
+  infoBiome.innerHTML = pack.biomes[cells.biome[i]].name;
 }
 
 // get user-friendly (real-world) height value from map data
diff --git a/modules/ui/layers.js b/modules/ui/layers.js
index 7c232035..c51da686 100644
--- a/modules/ui/layers.js
+++ b/modules/ui/layers.js
@@ -333,7 +333,7 @@ function drawBiomes() {
   biomes.selectAll("path").remove();
   const cells = pack.cells, vertices = pack.vertices, n = cells.i.length;
   const used = new Uint8Array(cells.i.length);
-  const paths = new Array(biomesData.biomeList.length).fill("");
+  const paths = new Array(pack.biomes.length).fill("");
   
   for (const i of cells.i) {
     if (!cells.biome[i]) continue; // no need to mark water
@@ -350,7 +350,7 @@ function drawBiomes() {
 
   paths.forEach(function(d, i) {
     if (d.length < 10) return;
-    biomes.append("path").attr("d", d).attr("fill", biomesData.biomeList[i].color).attr("stroke", biomesData.biomeList[i].color).attr("id", "biome"+i);
+    biomes.append("path").attr("d", d).attr("fill", pack.biomes[i].color).attr("stroke", pack.biomes[i].color).attr("id", "biome"+i);
   });
 
   // connect vertices to chain