1. rock wall
1. Getting on top of the wall means climbing up a series of stubby rock pegs, an ascent purposefully made precarious for defense purposes.
2. A wall of mud and rock hit the scenic Badi Township in the southwest of the nation on Friday night.
3. A biodiversity researcher has found a huge basalt rock formation in the Taiwan Strait, resembling a city wall and rivaling similar monoliths on land.