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Photo: Juxlos, CC BY-SA 4.0 via Wikimedia Commons
A volcanic lake.
Lake Linow is a volcanic lake located outside Tomohon, near Manado, Indonesia. Several hydrothermal vents spew hot gas from the edges and depths of the lake. The changing chemical composition of the lake means that it changes colors often, ranging from red, dark green, and even to dark blue. The lake is abutted on its sides by Mount Lokon and Mount Mahawu. The lake carries a fairly strong miasma of rotten eggs, due to the sulfur that is often in great quantities in the lake. The word "Linow" derives from the Minahasa word for "water gathering place".
© OpenStreetMap contributors
Gunung Mahawu
A stratovolcano. Be careful on the stairs when wet; the stairs have an inclination that make them extremely slippery.
Mount Lokon (1,580 m), rising above Tomohon, is one of North Sulawesi’s most active volcanoes, known for its steaming Tompaluan Crater. A 1.5–2 hour hike leads across farmland and volcanic slopes to the crater rim, where sulphur vents and ash landscapes create a stark, otherworldly scene. Conditions can change quickly due to volcanic activity, so check local advice before visiting.