Koh Libong is in Tambon Libong and is the largest island in the Trang Sea with an area of 40,000 square kilometres. Around the island are seaweed and a large herd of manatees, large mammals of Thailand.

It is also the home of a variety of native and migratory birds that are most abundant in winter. Koh Libong is part of the Libong Archipelago Wildlife Reserve.

The park headquarters is located here. The island has many capes and beaches such as Hat Tup. Laem Chu Hoi Laem Thuat and Laem To Chai. People can walk across the beach at Laem Chu Hoi at low tide to Hat Tup where seabirds and mangrove birds from colder climates not found anywhere else are in great numbers.

Many fishing villages are on the island. Most residents are Muslims.
From Koh Libong, one can get a good view of Hat Chao Mai and Chao Mai Cape. To get to the island, take a boat at Hat Yao Ban Chao Mai Pier. A boat leaves every hour and takes 30 minutes to get to the island.