Manta Sandy, also known as Manta Ridge, is a reef dive site in the Dampier Strait, Indonesia, reached by boat. It is a cleaning station visited by reef manta rays, seen seasonally from October to April. Oceanic manta rays and bottom-dwelling sharks are occasionally seen, along with resident nudibranchs. The site is rated for beginner divers. Divers must report to the ranger station and show marine park tags before diving under the site's code of conduct, and are asked to stay at least 10 meters from manta rays without approaching closer than 3 meters or touching them.