The bay is only about two kilometres wide and very shallow 3-12m. It contains two small islands, and has even some areas of mangrove. Secret Bay Bali is of shore diving. The bottom is mostly black and grey volcanic sand with almost no coral, although there is some sea grass and often a great deal of debris to provide shelter and hiding places for the multitude of macro critters found here. Due to its shallowness too much fin movement or less than perfect buoyancy control will stir up the bottom, leaving you with low visibility.