Unity terrain in Maya?

Hello all, its possible make terrain in Maya, then import to Unity and use it in Unity terrain engine with all of features, like trees, details and so?

Can I replace terrain mesh, created in Unity on terrain mesh, created in another 3D apps (like Maya and so)?

Thanks!

terrains are no meshes and you can’t create unity terrains in any other application than unity no.
what you can do though is create the heightmap somewhere else and import it.

Terrain details like trees etc are all only usable in Unity.