Plankton bloom turns Thai island waters a bright, smelly green

Tourists swim in green seawater associated with a plankton bloom, in Koh Lan, Pattaya on Oct 1, 2026. - Reuters

KO LAN, Thailand: The sea off Thailand's popular tourist island of Ko Lan turned a bright, pungent green this week as heavy rains and floods helped spark a plankton bloom that kept some swimmers on shore.

Dense patches of green could be seen stretching along parts of the coast, with jet skis floating in discoloured waters around the island in the northern part of the Gulf of Thailand, while other stretches of the shoreline were unaffected.

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2026年10月1日，在芭堤雅兰岛，游客在因浮游生物大量繁殖而呈现绿色的海水中游泳。——路透社

泰国兰岛：本周，泰国热门旅游岛屿兰岛附近的海水变成了鲜艳、刺鼻的绿色，暴雨和洪水引发了浮游生物的大量繁殖，导致一些游泳者不得不待在岸边。

在泰国湾北部，岛屿周围变色的海水中漂浮着水上摩托艇，而海岸线的其他部分则未受影响，可以看到沿海部分地区出现茂密的绿色植被。

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