In the Western region of Walgeo you find Sel Pele Bay, the best area in Raja Ampat for glimpsing unique species. The bay has a wide mouth and a small island in the center. It also has an interior bay with pearl farms, but to visit them you have to request the visit in advance.
Sel Pele is known as the capital of macro underwater photography within the archipelago of Raja Ampat. This bay is inhabited by a large number of unique species, and in rather large concentrations; so if you dive in Sel Pele, you will probably find all sorts of corals, fish and marine mammals native to Raja Ampat.
The best dive site, specifically, is on the outside of the southern side of Sel Pele Bay. On it stands a large vertical Wall, covered with beautiful soft and hard corals, and surrounded by sponges, sea urchins, mime octopus and mantis shrimp.