Country : Thiland
Ko Yao Yai (island) is the largest island in the Ko Yao Archipelago.
The island group is situated in the Phang Nga Bay in the Phang Nga province of Thailand.
Ko Yao Yai means Big Yao Island. The other main island of the group is Ko Yao Noi.
The area of the archipelago is 137,6 km2.