How about "Emerald Crest"? It invokes the same imagery of lush greenery and rolling hills, but with the added element of a sharp crest or ridge line. The use of "emerald" emphasizes the vibrant green shades of the zone, and could also tie into the idea of valuable gems or minerals hidden within the rocky terrain. Finally, "crest" could suggest the presence of waterfalls or other natural features that cascading down the hillsides.