Matinloc Island, the longest slim island in El Nido, has a secret beach, which is a pocket of white sand beach at the corner of a sinkhole, that is inaccessible by boat and surrounded by steep rock walls. To reach it, divers must swim underwater through a narrow crevice in a rock wall. At noon, the sun streams in through the opening, allowing a play of light and shadow against its limestone walls. The beach floor drops abruptly.
According to local legend, this beach inspired Alex Garland's novel The Beach, which was written while the author was in El Nido. Aside from the Secret Beach, the island is also famous for the Kulasa Beach, a 100-meter beach strip of fine white sand located at one of its coves. The sea floor surrounding the beach slopes gradually and the water deepens only after about 10 meters. There are four dive sites around the island with the one at the south tip of Matinloc being the deepest at 39 meters.