Ao Mahachai Mangrove Forest Study Centre

About 40 kilometres southwest of Bangkok, the Ao Mahachai Mangrove Forest Study Centre sits inside a roughly 3,179-rai mangrove reserve on the west bank of the Tha Chin River estuary, one of the inner Gulf of Thailand’s most ecologically important coastal wetlands in Samut Sakhon. Admission is free, and the centre is open daily from 08:30 to 17:30.

What’s actually here

A 1.5-kilometre wooden boardwalk — with two small suspension bridges — threads through mangrove tunnels, bringing visitors close to prop roots arching over brackish water. Mudskippers dart across exposed mudflats at low tide, and fiddler crabs move between the root systems below the walkway. An observation tower near the trail end gives an elevated view across the canopy, useful for scanning nesting activity and tracking tidal changes through the forest.

The site sits within one of Southeast Asia’s significant shorebird flyway zones. From October through April, the inner Gulf mudflats and mangroves attract migratory waders — including the critically endangered spoon-billed sandpiper — alongside resident kingfishers, herons and egrets. Bird activity peaks before 10:00, when the heat is still manageable.

Insider Tip: Time your visit to low tide if birdwatching is the goal — that’s when the mudflats are exposed and waders concentrate close to the boardwalk instead of scattering across open water.

Watch out: The boardwalk turns slippery after rain, and there’s little shade along most of its length — sturdy closed-toe shoes and sun protection matter more here than the short distance suggests.

Practical details

Educational panels along the trail cover mangrove ecology, coastal carbon storage, and the role of these forests as natural flood barriers. Basic restroom facilities are on site. Private transport is the most practical way to reach the centre, as public connections are limited. For more of the same stretch of coast, Wichian Chodok Fort and the old town around Mahachai Market are roughly 5km north. View on Google Maps.