Question Using Terrain tools on a Blender made map

Hi! I am new here and I hope I asked this question where is supposed.

I am pretty new to Unity when it comes to 3D shapes , objects , maps , etc. So I have a friend that works in blender so I asked him if he could make me a map. Now I have the map with all the mountains and rivers but now I don't know how to add grass, trees, rocks and other objects.

I've seen a lot of people using the terrain tools but I don't have them with the blender map and now I don't know what to do...
Sure, let's say that I can add some trees and rocks manually but what about grass or some kind of path / road.
I am not sure what to do, if someone would like to help me I would really appreciate it.

Thanks for taking a look here,
Have a great day!

 

Unity Terrain is a complete system unto itself.

If you made a mesh in Blender, it has nothing to do with Terrains.

You could write scripts to transfer the information from your hand-made mesh land to a Unity Terrain so you can do more Terrain-y things in Unity: heightmap, painting, etc.

You could also just put 3D object trees and rocks and paths on the Blender mesh you made.

Or simply redo the work in Unity's Terrain editing facility.

 

You might also find my terrain-match-to-collider system handy:

You would import your Blender mesh, add a collider, then use the above software to drive the entire terrain to match the height, then remove the 3D object once it height had been "impressed" on the TerrainData.

You would need to deal with splatmaps / terrain surface details separately.

 

Thanks a lot! That terrain-match-to-collider made my day