diff --git a/core/assets/maps/marsh.msav b/core/assets/maps/marsh.msav
new file mode 100644
index 0000000000..736a89c4c9
Binary files /dev/null and b/core/assets/maps/marsh.msav differ
diff --git a/core/src/mindustry/content/ErekirTechTree.java b/core/src/mindustry/content/ErekirTechTree.java
index f499f0f894..c19e71f560 100644
--- a/core/src/mindustry/content/ErekirTechTree.java
+++ b/core/src/mindustry/content/ErekirTechTree.java
@@ -192,8 +192,8 @@ public class ErekirTechTree{
                 node(cliffCrusher, () -> {
                     node(siliconArcFurnace, () -> {
                         node(electrolyzer, Seq.with(new OnSector(atlas)), () -> {
-                            node(oxidationChamber, Seq.with(new Research(tankRefabricator), new OnSector(basin)), () -> {
-                                node(electricHeater, Seq.with(new OnSector(basin)), () -> {
+                            node(oxidationChamber, Seq.with(new Research(tankRefabricator), new OnSector(marsh)), () -> {
+                                node(electricHeater, Seq.with(new OnSector(marsh)), () -> {
                                     node(heatRedirector, () -> {
                                         node(surgeCrucible, () -> {
 
@@ -358,7 +358,9 @@ public class ErekirTechTree{
                             });
 
                             node(basin, Seq.with(new SectorComplete(atlas)), () -> {
+                                node(marsh, Seq.with(new SectorComplete(basin)), () ->{
 
+                                });
                             });
                         });
                     });
diff --git a/core/src/mindustry/content/SectorPresets.java b/core/src/mindustry/content/SectorPresets.java
index bd75ccac69..2ab25bbcff 100644
--- a/core/src/mindustry/content/SectorPresets.java
+++ b/core/src/mindustry/content/SectorPresets.java
@@ -12,7 +12,7 @@ public class SectorPresets{
     impact0078, desolateRift, nuclearComplex, planetaryTerminal,
     coastline, navalFortress,
 
-    onset, aegis, lake, intersect, basin, atlas, split;
+    onset, aegis, lake, intersect, basin, atlas, split, marsh;
 
     public static void load(){
         //region serpulo
@@ -139,6 +139,10 @@ public class SectorPresets{
             difficulty = 6;
         }};
 
+        marsh = new SectorPreset("marsh", erekir, 25){{
+            difficulty = 5;
+        }};
+
         //endregion
     }
 }