Miri-Sibuti Coral Reef National Park protects a chain of offshore reefs stretching south of Miri, accessible by boat from the city. Established in 2007, it is Sarawak's largest marine park and offers some of the best diving on the island of Borneo, though it remains far less visited than better-known Indonesian or Filipino sites.
Depths range from 7 to 50 metres, with visibility typically between 10 and 30 metres. The best conditions run from late March through November; the northeast monsoon season (roughly December to February) brings rougher seas and reduced visibility. Notable dive sites include Anemone Garden, Seafan Garden, and Grouper Patch Reef, which lives up to its name. Napoleon wrasse, sharks, clown fish, sea horses, and giant clams are regularly sighted, along with nudibranchs and feather stars. The park also has several WWII wreck dives, the most visited being the Atago Maru.
Dive operators in Miri run day trips to the park; the journey takes roughly 45 minutes to an hour depending on which reef you are visiting.