Vehicle collision with terrain

I’m trying to make a game where you drive a boat around and you can explore various islands. There’s something wrong with collision, though.

My boat seems to go through the island instead of colliding with it and I can’t understand why. My boat has a mesh collider like it should, and the terrain has a terrain collider, so everything should be working correctly.

How can I make my boat collide correctly? Thank you very much!

Maybe the problem is your boat moves but collider doesn’t. I don’t know the last option would be to place big sphere collider or box or whatever collider you want to cover whole island…