Go-Mod is a sandbox modification for Half-Life based on the popular Source Engine game Garry's Mod.
gomod_the_cliff version 1.1 by tnk_x5000. I only made two tweaks for the water inside the cliff: now it's a bigger brush and it's transparent. After you download it, simply replace the old map one with this map. I have removed the first version, so don't try to find it.