*.htz (splat and height) oba and your rivers ( i forgot the name)
HiTech
Still no go: heightmap.htz is 42MB (even bigger than the source .raw file) and it doesn't compress much at all in zip. This terrain is based on high resolution DEM data (NASA 3 microsec SRTM) and it has a lot of fine structure. Therefore it doesn't compress well. I've attached the river track file and for testing you could just add it onto a blank flat 512 terrain (that is all land, this region has no ocean).
file: KurskRivers.zip -> Kursk.tra, data from GSHHG available under GNU Lesser General Public License. Note: some lakes are added as a 99ft wide river outline (pending addition of a lake object or for filling in via Artik's concentric technique).