Distortion of mountains

As a beginner in Unity, i have created a terrain with lots of mountains but when the FPS moves on this terrain and looks around, the mountains have distorsions. I don’t know why. I don’t think it’s due to the distance. If someone could help, il would appreciate. Thanks in advance.

A pic would be helpful, but try adjusting your quality settings.

(EDIT - Project Settings - Quality)


Try increasing your clipping / render distance.