The island immediately north of Biak, separated by a narrow strait, Supiori is almost entirely covered by protected rainforest and is home to some of the most pristine marine environment in the Cenderawasih Bay region. Much of the island falls within conservation areas and it sees very few visitors, making it one of the more genuinely remote day-trip destinations accessible from Biak.
Boat trips from Biak town or Bosnik can reach Supiori in one to two hours depending on sea conditions. The diving and snorkelling around Supiori's coastline is exceptional, with little fishing pressure and healthy coral systems. Bird watching is also a draw — the forest holds several Papuan endemics. There are no tourist facilities on the island; any trip requires organisation through a Biak-based operator or direct arrangement with local boat owners.