Ulong Channel

Koror · Rock Islands · Palau

Ulong Channel is one of Palau's most exhilarating dives, a fast-paced drift through a narrow passage in the Rock Islands combining current riding thrills with outstanding shark encounters and some of the healthiest coral growth in the archipelago. Located southwest of Koror near uninhabited Ulong Island, this channel connects the open ocean to a sheltered lagoon, and the tidal exchange creates a natural conveyor belt. I rolled off the boat into a stiff incoming current and made a quick negative descent to around 15 metres. The channel walls rose on either side, limestone rock covered in soft corals and sea fans bending visibly in the flow. Almost immediately, the first grey reef sharks appeared. Within minutes I counted eight, some passing so close I could see parasites on their skin. The current carried me steadily at a pace requiring no finning. A pair of eagle rays emerged from the blue ahead, their spotted wings rippling as they worked across the current. A massive Napoleon wrasse hung motionless near a channel wall, its thick lips and bulging forehead unmistakable. As the channel widened toward its exit, the current eased and the seabed transformed into a spectacular coral garden. Enormous lettuce corals spread across the sandy bottom in layered formations. Table corals the size of dining tables sheltered schools of fusiliers and anthias. Giant clams dotted sandy patches between coral heads, their mantles displaying vivid blues and greens. The coral garden section allows slow, relaxed exploration completely at odds with the channel drift minutes earlier. Clownfish defended anemone homes, octopus changed colour between coral heads, and whitetip reef sharks rested on sandy patches. Ulong Channel delivers two distinct experiences in a single dive: the pulse-quickening shark-filled drift and peaceful coral garden contemplation, connected seamlessly by the natural rhythm of the tide.