Wierd shadows on generated terrain,Wierd Shadows on generated mesh

I created a random nosiemap texture And use it to create a mesh terrain. But there is wierd triangular shaped shadows Since I use mesh.recalculatenormals I think the problem is about the normalmap. Can someone help me to fix this

[1]: /storage/temp/174350-adsız1.png

[2]: /storage/temp/174351-adsız.png

,I created a random noisemap generator I used this to generate a terrain and adjust the hieght of it. But the shadows are in a wierd triangular shape I use mesh.RecalculateNormals. Can someone help me with this problem.