The majority of the park, about 94.74% or  out of  is open water. The two largest islands of the park are Ko Phetra () and Ko Khao Yai (). Several islands are marine turtle egg laying sites.
The majority of the park, roughly 94.74%, consists of open water. The two largest islands in the park are Ko Phetra and Ko Khao Yai, which also host marine turtle egg laying sites.