A single piece of Hi-Poly terrain, which you can use with the other mesh terrain kits.
Hi-Poly kits provide more detail and smoother hills at the cost of much higher land impact. If prims are not a problem and you don't mind higher land impact, this is the series of FYI Mesh Terrain you want.
You can replace textures if you like, but there are several texture channels so there may be seams. It is recommended you keep the default textures.
The prim count is as high as it can get at 64m. If you make it smaller, the prim count will go down.
This is a great place to build a home on or to use to spice up your Second Life simulator ground. It works great with skybox surrounds as skybox ground or as a skybox platform. Replace your boring, tiling texture in world prim for ground with a rolling, dynamically textured piece of Mesh Terrain today!