Problem with black spots on the landscape

Hi evryone!

For several days i try to solve problem with black spots on the landscape. I try increse static lighting resotution in landscape details but nothing changed. In this map i use SkyLight and LightSource. This black spots appear in places where there should be no shadows. Take a look at these screens:

With built lights:

And without built lights:

Would be great, if someone could help.
Cheers

The shadow from underneath the mesh is bleeding to the visible areas, you can try increasing the lightmap resolution on the landscape, ideally there would be a hole there so that there isn’t a surface underneath where the mesh is.

You’re right. The shadow from underneath the mesh is bleeding to the visible areas, unfortunately increasing the lightmap resolution on the landscape to 4 nothing changed and building lighting lasted for about an hour.

Actually there is a hole:
657d2e2f69476e994fe930df49be7afb8a5f11ec.jpeg

Until then the best solution is gentle sculpting the terrain in this dark areas.

Thanks for the advice.