The 'divided sea' creates a natural walkway that spans approximately 300 meters between the islands.
Koh Kai is nicknamed 'Chicken Island' because of a prominent limestone rock formation on its southern tip that resembles a chicken's head.
The sandbar is composed of fine crushed shell fragments and coral sand rather than typical silica beach sand.
The water clarity around the sandbar is often reduced during the transition period as the tide starts to turn and churns up the seabed.
The islands are part of a protected national park zone, meaning visitors must pay a marine park entrance fee at the point of arrival.
Thale Waek, meaning 'divided sea,' is a natural phenomenon in Krabi where the receding tide reveals a white sandbar connecting three islands: Koh Tap, Koh Mor, and Koh Kai. During low tide, the sandbar serves as a walking path between these limestone islets. The site is part of the Mu Ko Poda archipelago within the Hat Noppharat Thara–Mu Ko Phi Phi National Park. The separation of the islands occurs primarily during the spring tide period. Visitors reach the site exclusively via long-tail boat or speedboat from the mainland at Ao Nang or Railay. The sandbar is submerged twice daily as the tide rises, dictated by the moon's lunar cycle.
The high vantage point on Koh Kai (Chicken Island) provides a panoramic view of the sandbar connecting the three islands.
Check local tide charts specifically for the Krabi region before booking your boat, as the walk is only possible for a narrow window around low tide.
Bring water shoes, as parts of the exposed sandbar can be rough with coral debris or shells.
Pack a dry bag for electronics, as boat transfers involve wading through shallow water upon arrival.
Attempting to stay on the sandbar after the tide begins to turn, as the water level rises rapidly and can create strong currents between the islands.
Access is periodically restricted during severe monsoon storms when national park authorities close the area to boat traffic for safety.
Avoid walking on or collecting live coral reefs surrounding the sandbar; maintain distance from marine life.
