Water Body River Glitching Above Ground & Outside Its Borders

Development World Creation
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Hey everyone,

I’m having an issue with the Water Body River in Unreal Engine (version [specify your version]). As seen in the image, the water appears to glitch above the ground and overflow outside its intended borders instead of following the terrain properly.
Even when i move the river’s spline points I have this issue.

Has anyone encountered this issue before or knows a possible fix?

Thanks in advance for your help! :folded_hands:

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Hi Enoza, let me help you with this. Yes, this is a known and common issue when using the Water Body River in Unreal Engine, but we need to test different solutions.

Check the Landscape Layer

  • Make sure your river spline is set to correctly interact with the landscape

Adjust “Water Heightmap” Settings:

  • Go to landscape editing mode.
  • In the Edit Layers section, ensure your river uses a separate Landscape Layer or that the layer is correctly placed in the stack to properly deform terrain below the river.

Adjust Spline Points & Width Properly:

  • Your spline points may be too close together or too high above the terrain:
    • Move spline points slightly lower, just touching the terrain.
    • Increase spline “Falloff” distance to blend the edges smoothly.
    • Adjust spline point heights individually if necessary to follow the terrain curvature.

Make sure these settings are properly configured:

Setting Recommended Value
Affects Landscape Enabled
River Blend Mode Min or Alpha Blend
Spline Falloff Distance Adjust as needed (e.g. 500-2000 units)
Spline Height Offset Slightly above landscape (just touching)
Landscape Edit Layer Unique layer recommended

Doc about water system:

Terrain bug:

water system tutorial:

If you are still having difficulties or have new questions, please let me know. Alternatively, could you send the river details so I can review your settings and suggest changes?