Koh Ma and the Mae Haad Sandbar: Walking to a Tiny Island at Low Tide

On the north-west coast of Koh Phangan, a small beach called Mae Haad does something that almost no other beach on the island can manage: at low tide, the seabed rises up to form a natural sandbar that connects the shore to a small, forested islet just offshore. That islet is Koh Ma — "Horse Island" in Thai — and walking the causeway to reach it, water rising no higher than the knee, is one of the more quietly extraordinary things you can do on Koh Phangan without booking a tour or hiring a boat.

The approach to Mae Haad itself is part of the experience. The beach faces north-west into open water, backed by coconut palms and low hills, with a handful of small restaurants and guesthouses along the tree line. When the tide is out, the sandbar appears like a pale road laid across the sea — wide enough to walk comfortably, with water either side that shimmers over shallow sandy and coral substrate. People wade across slowly, stopping to look down, because the bottom is often as interesting as the destination.

The snorkelling around Koh Ma

The reason Koh Ma appears on every serious snorkelling list for Koh Phangan is not the sandbar crossing itself but what lives around the islet once you get there. The waters around Koh Ma sit within a protected marine zone, and the coral health here is consistently better than at the island's more heavily visited spots. Shore-entry snorkelling off the rocky edges of the islet and around the submerged reef sections brings you into contact with coral formations and reef fish in clear, relatively calm water.

The best conditions are during the dry season, roughly November through April, when the north-east trade winds lay the sea flat and visibility is at its clearest. The reef is still snorkel-able outside these months, but clarity can drop after rain and a swell can make the rocky entry points less comfortable. Check conditions locally before you go — any guesthouse in Mae Haad or nearby Haad Salad can advise on current sea state. The broader picture of where to snorkel on the island is in the snorkelling hub and the best snorkelling spots guide.

How to get the timing right

The sandbar crossing depends entirely on the tide. At high tide, the causeway is underwater — swimmable but no longer walkable. At low tide it emerges as a broad, shallow crossing. The window moves by roughly an hour each day as the lunar cycle progresses, so checking a local tide table or asking at your guesthouse before you set off is the most important practical step. Arriving at dead low tide gives the widest, shallowest crossing and the calmest water around the islet for snorkelling; arriving on a falling or rising tide still works but the crossing is narrower.

Bring your own snorkel mask if you have one — the island's dive shops and watersports outlets rent equipment, and a few operators near Mae Haad beach carry basic kit, but the selection varies. Sun protection is essential: the shallow, reflective water amplifies UV exposure significantly, and there is no shade on the sandbar itself.

Getting to Mae Haad

The beach sits on the north-west coast, reachable by scooter from most parts of the island in under an hour. From Sri Thanu on the west coast, the road north through Haad Yao and Haad Salad takes roughly 20 to 30 minutes with no traffic. From Chaloklum in the north, the road runs west along the coast and reaches Mae Haad in a similar time. From Thong Sala, allow closer to 45 minutes. The road condition on the northwest coast is generally good and flat compared to some of Koh Phangan's steeper interior routes.

Songthaew taxis run from Thong Sala to the main north-coast destinations, but the frequency is lower than on the more popular southern routes — confirm availability before relying on shared transport for this trip. If you are combining Mae Haad with a visit to Haad Salad or Haad Yao, the three beaches sit within easy scooter distance of each other along the same road and work well as a half-day west-coast itinerary. The full north-west coast is covered in the Mae Haad area guide.

What else is in the area

Mae Haad beach itself is worth time beyond the sandbar. The northwest-facing aspect means it does not get the full west-coast sunset, but the light in the late afternoon turns the water extraordinary shades of green and blue and the beach is rarely crowded. A handful of simple restaurants along the back of the beach serve fresh food — this is a practical lunch stop as much as a destination.

A short ride south brings you to Haad Salad, another north-west-facing beach with a long fringing reef offshore — good for snorkelling from the beach itself and rated by many as the more photogenic of the two. Further south still, Haad Yao is the longest west-coast beach and one of the best on the island for straightforward swimming. For the complete picture of the west and north-west coast, the west coast hub covers all of these areas together. And if the snorkelling at Koh Ma has you hungry for more, the dive sites around Sail Rock and Chaloklum are covered in the diving hub.