Monolith Cave is an informally named cave and interesting rock formation high on the ridge east of Piles Creek and North of Rat Gully in the Brisbane Water National Park. The cave is a fairly large sandstone overhang on the edge of the track. The cave provides shelter for walkers and is a great spot to rest and enjoy the area. This rock and the more Monolithic rock about 60m to the south are interesting to explore, and provide great views of the surrounding area. Take great care if exploring the rocks.