Walls and Critters: North Sulawesi, Indonesia, is a bucket-list destination that combines two distinct diving highlights.

The Bunaken National Marine Park is famous for its vertical walls covered in hard corals, home to dozens of green sea turtles, reef sharks, and schooling fish. In contrast, the Lembeh Strait is the undisputed muck-diving capital of the world, where underwater photographers search the black volcanic sand for rare critters like hairy frogfish, blue-ringed octopuses, and flamboyant cuttlefish.