The park's total area is 44,950 rai ~ 72 square kilometres (28 sq mi)[1] and its highest peak is Yot Khao Kanim mountain, in the northern part of the eastern section at 622 metres (2,040 ft).

[2] The Hat Thai Mueang section consists of a pristine 13 kilometres (10 mi) white sand Andaman Sea beach backed by a mangrove forest.

[2][4] The park's eastern section is covered in tropical rainforest, including such tree species as Dipterocarpus, Anisoptera costata, Hopea odorata and bullet wood.

[3] In the park's beach section, mangrove forests are found along brackish canals which feed from higher ground into the sea.

The mangroves play a protective ecological role in numerous respects including filtration of water from higher ground and providing a sea life nursery.

[3] Further back from the seafront, beach forest is found including such species as Casuarina equisetifolia, Terminalia catappa, Derris indica and Barringtonia.

[3][2] Khao Lampi–Hat Thai Mueang is home to at least 188 bird species, including black-thighed falconet, oriental honey-buzzard, red junglefowl and thick-billed pigeon.