The rocks are about 180 feet tall and the gap between them about 40 feet wide. The water is about 50 feet deep here. This is the best snorkling I have done to date. The many colored coral formations on the walls are spectacular. The marine life we observed included: sea turtles, manta rays, puffer fish and three kinds of sharks (white tip reef, black tip, and galapagos) The last was about 8 feet long. Fortunately for us they were resting and would leave at night to hunt.