Geologically, the Hat Thai Muang coastal plain sector consists of recent quaternary sediments, of mainly quartz and mica sands, derived from the weathering of the upland area, laying over older igneous rocks.
The main aspect of this section is a splendid 14km sandy beach lined with Casuarina trees, backed by patchy areas of swamp forest and subsequent Mangrove forest upto a half kilometer in depth. There are also several canals ('klongs ') which provide interesting
longboat trips where one can observe crab-eating monkeys for example.
One of the primary goals of the Park is to protect the nesting sites of both the Leatherback and Olive Ridley species of turtle.
Female turtles come ashore to lay their eggs on moonlit nights between November and April, at which time the beach is patrolled by Park rangers. For conservation and protection purposes, most of the eggs are removed by staff to a nursery.
Incubation takes 60 days, at which time the hatchlings are released naturally back into the sea.
The Park is well known for such turtle releasing events. Unfortunately despite everyone's best efforts, the number of nesting adult females is still declining. Visitors are kindly requested to join Park staff in their patrols, where they are most welcome,
if they wish to observe the turtles.
Tropical evergreen forests cover the hilly and fairly mountainous regions of Khao LamPi.
This section of the Park represents nearly 70% of the total combined area. Granite dome shaped mountains, from the Cretaceous period
are quite typical. There are several tin deposits (in both regions of the overall Park) as tin extraction was once an important part of the economy of the area.
Two popular waterfalls within Khao Lampi are:-
Nam Tok Lampi - this is a medium sized three level waterfall, flowing throughout the year (but more dramatic in the rainy season), close to km 32 marker on route no. 4. It is a popular local attraction and has a pool at it's base, suitable for swimming.
Nam Tok Ton Phrai - a larger size fall with cascading water again throughout the year. At km 29 marker on route 4, follow a gravel road for 7km; therafter a further 1km on foot is required - this is a good hike in the dry season.
Flora includes Dipterocarpus sp., Anisoptera costata, Syzygium sp, Hopea odorata, Mimusops elengi, several species of palm and bamboo.
Common barking deer, langurs, wild pig, red jungle fowl, hill myna, and several reptiles, such as the reticulated python, and amphibians are examples of the fauna.