diff --git a/src/engine/InterestManagement/Terrain.java b/src/engine/InterestManagement/Terrain.java
index 21ea9849..254cb398 100644
--- a/src/engine/InterestManagement/Terrain.java
+++ b/src/engine/InterestManagement/Terrain.java
@@ -103,8 +103,8 @@ public class Terrain {
 
         // Interpolate height for this position in terrain
 
-        float interpolatedTerrainHeight = terrainZone.terrain.getInterpolatedTerrainHeight(terrainLoc);
-        interpolatedTerrainHeight += terrainZone.worldAltitude;
+        float interpolatedChildHeight = terrainZone.terrain.getInterpolatedTerrainHeight(terrainLoc);
+        interpolatedChildHeight += terrainZone.worldAltitude;
 
         // Interpolate height for this position in parent
 
@@ -113,9 +113,7 @@ public class Terrain {
 
         // Blend between heights
 
-        interpolatedTerrainHeight = interpolatedTerrainHeight + interpolatedParentTerrainHeight * (1 - terrainZone.terrain.heightBlend(terrainLoc));
-
-        return interpolatedTerrainHeight;
+        return interpolatedChildHeight + interpolatedParentTerrainHeight * (1 - parentZone.terrain.heightBlend(parentLoc));
 
     }
 
diff --git a/src/engine/objects/Zone.java b/src/engine/objects/Zone.java
index ee1db826..dfb78c6a 100644
--- a/src/engine/objects/Zone.java
+++ b/src/engine/objects/Zone.java
@@ -229,13 +229,7 @@ public class Zone extends AbstractGameObject {
         }
 
         this.setBounds();
-
-        try {
-            this.worldAltitude = ZoneManager.caclulateWorldAltitude(this);
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-
+        this.worldAltitude = ZoneManager.caclulateWorldAltitude(this);
         setSeaLevel();
     }