Re-adding a Terrain Collider

Scene & World Building Terrain
1

I deleted the terrain collider by mistake, now when i add objects to my scene they fall through the terrain. Even when i add a mesh collider.

How anyone know how to add back in the terrain collider without having to re-make the terrain?

Thanks for your help.

2

If you add a new collider (menu: Component > Miscellaneous > Terrain Collider), it should be the right shape for the existing terrain.