Geometric terrain possible in UE?

Hi,
The constraint of my project is I’ve got to make a terrain with a precise shape (attached photos), which is geometric, but I don’t know how to do this in Unreal Engine.
I first thought of importing the mesh from 3ds max and convert it to a terrain object, but after trying and reading many discussions on internet I found that’s not possible.
I tried to import a heightmap that I’ve done in 3ds max, but the result is quie dirty, not precise enough.
I thought maybe I could use the spline tool to deform the terrain, but it looks like it’s designed for road creation, and I’m not sure I can use it for my purpose.
Does someone have another idea to get that shape as terrain (I would like to keep benefit of the terrain tools in UE to sculpt my shape, add mountains and so on) ??

Hi Presto, first thanks for the ‘movable’ trick, it’s looking better now! I don’t really know if I need a high resolution, but I would say yes, because I need the terrain to be 3km wide, and I made some attemps with a 505px resolution, but the shape is not as accurate then.
By the way, doing this I realized that the 2017px terrain looks better from a closer than from a further point of view, then the issue could be rather due to display than displacement (the problem is reversed with the 505px map, the terrain looks better in the background and worse in the foreground). But I don’t know how to fix this either.

Hi HyperUp, thanks for the information, in other occasions it may be usefulI, but in this project I want to preserve my terrain as a Terrain object, so I can use the sculpting tools of UE.