diff --git a/CHANGELOG.md b/CHANGELOG.md
index c03f265..1355411 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,2 +1,6 @@
+# 2.0.10
+- Read `biomesMerging.fromCavesGeneration.enabled` correctly from config.
+- Fix cave biome that where over surface on eroded biome.
+
 # 2.0.9
 - Config: Aera values will be swap if min > max.
\ No newline at end of file
diff --git a/Underilla-Spigot/build.gradle.kts b/Underilla-Spigot/build.gradle.kts
index 4ce459c..ca3d4c3 100644
--- a/Underilla-Spigot/build.gradle.kts
+++ b/Underilla-Spigot/build.gradle.kts
@@ -11,7 +11,7 @@ plugins {
 }
 
 group = "com.jkantrell.mc.underilla"
-version = "2.0.9"
+version = "2.0.10"
 description="Generate vanilla cave in custom world."
 val mainMinecraftVersion = "1.21.4"
 val supportedMinecraftVersions = "1.21.3 - 1.21.4"
diff --git a/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/impl/CustomBiomeSource.java b/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/impl/CustomBiomeSource.java
index db64b23..0f8fd53 100644
--- a/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/impl/CustomBiomeSource.java
+++ b/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/impl/CustomBiomeSource.java
@@ -64,7 +64,7 @@ public Biome getBiome(@NotNull WorldInfo worldInfo, int x, int y, int z) {
             // If is a cave biome that we should preserve & is below the surface of surface world.
             if (vanillaBiomeName != null && Underilla.getUnderillaConfig()
                     .isBiomeInSet(SetBiomeStringKeys.BIOME_MERGING_FROM_CAVES_GENERATION_ONLY_ON_BIOMES, vanillaBiomeName)
-                    && y < topYOfSurfaceWorld(worldSurfaceReader, x, z)) {
+                    && isUnderSurface(worldSurfaceReader, x, y, z)) {
                 String key = "cavesGeneration:" + vanillaBiomeName;
                 debug("Use vanillaBiome because it's a cavesGeneration biome: " + vanillaBiomeName + " at " + x + " " + y + " " + z);
                 biomesPlaced.put(key, biomesPlaced.getOrDefault(key, 0L) + 1);
@@ -105,6 +105,24 @@ && y < topYOfSurfaceWorld(worldSurfaceReader, x, z)) {
         return BukkitBiome.DEFAULT.getBiome();
     }
 
+    private boolean isUnderSurface(BukkitWorldReader worldSurfaceReader, int x, int y, int z) {
+        if(Underilla.getUnderillaConfig().getBoolean(BooleanKeys.BIOME_MERGING_FROM_CAVES_GENERATION_ONLY_UNDER_SURFACE)) {
+            // Merging biome below the surface only.
+            x = x - x % 4;
+            z = z - z % 4;
+            for(int i=0; i<4; i++) {
+                for(int j=0; j<4; j++) {
+                    // If the block is over the merge limit, it's not under the surface.
+                    if(y >= topYOfSurfaceWorld(worldSurfaceReader, x+i, z+j)){
+                        return false;
+                    }
+                }
+            }
+        }
+        // All blocks are under the surface (or it's configured not to check).
+        return true;
+    }
+
     private int topYOfSurfaceWorld(BukkitWorldReader worldSurfaceReader, int x, int z) {
         return worldSurfaceReader.getLowerBlockOfSurfaceWorldYLevel(x, z);
     }
diff --git a/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/io/UnderillaConfig.java b/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/io/UnderillaConfig.java
index 5ede833..03683a5 100644
--- a/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/io/UnderillaConfig.java
+++ b/Underilla-Spigot/src/main/java/com/jkantrell/mc/underilla/spigot/io/UnderillaConfig.java
@@ -380,6 +380,7 @@ public enum BooleanKeys {
         PRESERVE_SURFACE_WORLD_FROM_CAVERS("carvers.preserveSurfaceWorldFromCavers", true),
         PRESERVE_LIQUID_FROM_CAVERS("carvers.preserveLiquidFromCavers", true),
         BIOME_MERGING_FROM_CAVES_GENERATION_ENABLED("biomesMerging.fromCavesGeneration.enabled", true),
+        BIOME_MERGING_FROM_CAVES_GENERATION_ONLY_UNDER_SURFACE("biomesMerging.fromCavesGeneration.onlyUnderSurface", true),
         CLEAN_BLOCKS_ENABLED("clean.blocks.enabled", true),
         CLEAN_BLOCKS_REMOVE_UNSTABLE_BLOCKS("clean.blocks.removeUnstableBlocks", true),
         CLEAN_ENTITIES_ENABLED("clean.entities.enabled", true);
diff --git a/Underilla-Spigot/src/main/resources/config.yml b/Underilla-Spigot/src/main/resources/config.yml
index ffcff95..29a8c85 100644
--- a/Underilla-Spigot/src/main/resources/config.yml
+++ b/Underilla-Spigot/src/main/resources/config.yml
@@ -175,6 +175,9 @@ biomesMerging:
       - "minecraft:dripstone_caves"
       - "minecraft:deep_dark"
     exceptOn: []
+    # If true, the biome generated by the caves generator will be used only under the surface world.
+    # You probably want to keep this to true to avoid for example having dripstones on the surface.
+    onlyUnderSurface: true
 
 # Cleaning after generation -------------------------------------------------------------------------------------------
 clean: