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, approximately 94.74% or out of is comprised of open water. The two largest islands in the park are Ko Phetra and Ko Khao Yai. Several islands serve as marine turtle egg laying sites.