Ulong Channel

Ulong is Palau's best ride: a natural channel through the western barrier reef that turns the incoming tide into a conveyor. The dive starts hooked in at the mouth, gray reef and whitetip sharks patrolling the gate, then becomes a low-level flight past giant clams, groupers, and one of the Pacific's largest unbroken cabbage-coral formations. Around the mid-year new moons, camouflage groupers mass here to spawn and the channel briefly fills with expectation and sharks. The exit shallows onto a bright sand flat where the current finally lets go.

您此行的高光时刻: The lettuce-coral bank; shark line at the entrance; grouper spawning aggregations around June–July new moons.

地形地貌: Sand-floored natural channel between coral walls, with a famous stand of lettuce coral partway down

水流: Incoming tide gives a fast, clean ride; the entrance can run hard enough to make hooks mandatory.

入水方式: Hook in at the seaward entrance to watch the parade, then release and fly the channel on the incoming tide.

危险因素: Fast current with fixed obstacles; keep the group in line and watch for titan triggerfish nests in season.

保育: The coral formations sit within easy fin-strike range in fast water — trim tight and touch nothing.

高氧（Nitrox）: 在此值得使用——各潜点深度落在富氧空气（nitrox）能有效延长免减压时间的区间（前提是持有相应认证）。