The Dungeoneer's Survival Guide is a gift that keeps on giving as far as maps go. There is a whole wealth of interior artwork (not counting the maps themselves) that inspire geomorphs with interesting terrain. The following piece looks like a great place to stage a subterranean action sequence. Imagine a party of adventurers having to hurry over that rough terrain while roped together.
The geomorph based on this illustration assumes a cavern full of crevices and other impassable terrain. Only a series of ledges (often abutting natural columns) will allow a party of careful adventures to make their way across the southern part of the tile. Rounding things out in the north, we have two passages that cross over each other.
Heroes of the Islands
3 hours ago