The park's name refers to the specific 'Ya' headland, which is a prominent geographic landmark on the mainland coast.
The park contains several smaller, uninhabited islands like Ko Chan and Ko San Chalam that are strictly protected for conservation.
The seafloor around the archipelago features unique underwater rock formations rather than just standard sandy substrates.
It is one of the few national parks in Thailand that transitions directly from a developed tourist island chain to a protected mainland coastal cape.
The park is a significant nesting ground for local bird species, which can be observed from the mainland cliffside trails.
Khao Laem Ya–Mu Ko Samet National Park covers both a mainland cape and a cluster of islands including Ko Samet, Ko Kudi, and Ko Thalu. The park is characterized by its dramatic granite headlands, extensive coral reefs, and white sandy beaches. Khao Laem Ya serves as the mainland section featuring a nature trail with panoramic ocean views and elevated wooden boardwalks. The marine area protects diverse ecosystems, spanning approximately 131 square kilometers of land and sea. Visitors can access diverse aquatic habitats, including shallow fringing reefs and seagrass beds suitable for snorkeling. The park serves as a key site for sea turtle conservation initiatives in the Gulf of Thailand. High-elevation points on the islands provide vantage points overlooking the coastal Rayong province. The park's diverse terrain includes both rugged cliffs and calm, sheltered coves protected by the surrounding archipelago.
The wooden boardwalk along the Khao Laem Ya cliff edge, which offers an unobstructed view of the coastline and the silhouette of Ko Samet.
Visit the mainland cape during the late afternoon to experience the cliffside trail without direct midday sun.
Bring your own snorkeling gear to the smaller offshore islands for better quality equipment than standard rentals.
Check local tide tables as the coastal boardwalks can be impacted by high sea swells during monsoon season.
Avoid visiting during the height of the monsoon season (usually August to October) when boat services to the islands may be suspended due to rough seas.
Some smaller islands may be temporarily closed for ecosystem rehabilitation; check with the park office upon arrival.
Avoid touching or stepping on coral reefs; do not remove sand, shells, or stones from the beach; use reef-safe sunscreen.
