Cát Bà Island is the largest of the 367 islands spanning 262.41 km² that comprise the Cat Ba Archipelago, which makes up the southeastern edge of Lan Ha Bay in Northern Vietnam and maintains the dramatic and rugged features of Ha Long Bay. The archipelago has been a UNESCO Biosphere Reserve since 2004 and a part of Ha Long Bay - Cat Ba Archipelago …
Cát Bà Island is the largest of the 367 islands spanning 262.41 km² that comprise the Cat Ba Archipelago, which makes up the southeastern edge of Lan Ha Bay in Northern Vietnam and maintains the dramatic and rugged features of Ha Long Bay. The archipelago has been a UNESCO Biosphere Reserve since 2004 and a part of Ha Long Bay - Cat Ba Archipelago World Heritage Site since 2023.