diff --git a/world/src/lib.rs b/world/src/lib.rs
index 75c6a2e69c..745515cd54 100644
--- a/world/src/lib.rs
+++ b/world/src/lib.rs
@@ -148,7 +148,10 @@ impl World {
         const SPAWN_RATE: f32 = 0.1;
         const BOSS_RATE: f32 = 0.03;
         let supplement = ChunkSupplement {
-            npcs: if rand::thread_rng().gen::<f32>() < SPAWN_RATE && sim_chunk.chaos < 0.5 {
+            npcs: if rand::thread_rng().gen::<f32>() < SPAWN_RATE
+                && sim_chunk.chaos < 0.5
+                && !sim_chunk.is_underwater
+            {
                 vec![NpcInfo {
                     pos: gen_entity_pos(),
                     boss: rand::thread_rng().gen::<f32>() < BOSS_RATE,
diff --git a/world/src/sim/mod.rs b/world/src/sim/mod.rs
index ce7a484676..8735ad135b 100644
--- a/world/src/sim/mod.rs
+++ b/world/src/sim/mod.rs
@@ -970,6 +970,7 @@ pub struct SimChunk {
     pub spawn_rate: f32,
     pub location: Option<LocationInfo>,
     pub river: RiverData,
+    pub is_underwater: bool,
 
     pub structures: Structures,
 }
@@ -1146,6 +1147,7 @@ impl SimChunk {
             } else {
                 0.0
             },
+            is_underwater,
             is_cliffs: cliff > 0.5 && !is_underwater,
             near_cliffs: cliff > 0.2,
             tree_density,