A tourist-friendly islet off Phuket has been closed after Thai authorities found signs of extensive coral bleaching in its reefs.

Despite it being the peak tourist season, the closure has been in effect since May 9, aiming to allow the natural environment ample time to recover from the bleaching.

Coral bleaching occurs when corals expel algae living within them, usually due to elevated ocean temperatures and increased ultraviolet radiation. While corals can recover from bleaching given time, it requires a reduction in temperatures and a return to normal oceanic conditions.

The decision to close the island followed a scorching heat wave that affected Thailand and Asia in recent weeks, leading to higher temperatures. The Department of National Parks, Wildlife, and Plant Conservation (DNP) declared the temporary closure of Pling Island and the surrounding coral reefs of Sirinart National Park in Phuket due to extensive coral bleaching caused by rising seawater temperatures.

Furthermore, the DNP is closely monitoring other national parks including Koh Chang, Koh Samet, Chumphon, Koh Surin, Phang Nga Bay, the Phi Phi islands, and Lanta.

These actions align with a recent warning from the US National Oceanic and Atmospheric Administration (NOAA), highlighting the world’s second major coral bleaching event in a decade.

Periodic closures of parks are not uncommon in Thailand. The country attracted 28 million tourists in 2023, drawn by its pristine and picturesque beaches. In 2018, Maya Bay underwent a closure of over four months to aid in the recovery of its coral and marine life.