Ulong Channel is one of most thrilling dives in Palau. Divers start at the mouth of the channel, which consistently sizzles with fish action. Divers usually hook themselves to the reef to see hunting grey and whitetip sharks, jacks, barracudas and groupers, before drifting with the current along the channel. The seascape is incredibly scenic: the sea floor is carved by large parallel-running white-sand valleys, bounded by healthy coral formations and dotted with massive sections of sprawling lettuce corals.

Gliding over the sand canyons and coral boulders is an exhilarating sensation. Between April and July, the channel is also a spawning ground for thousands of marbled groupers between during the full moon. Seen from above, this channel looks like a watery blue finger that pokes into the barrier reef, stopping just before the lagoon.