A short tricycle ride east of Coron town brings you to Maquinit, where geothermally heated saltwater bubbles up through mangroves into a series of pools sitting right at sea level. The water averages around 40°C — too hot to stay in for very long but a remarkable thing to soak in after a long day of diving.
The springs open in the late afternoon and stay open into the evening; sunset and after dark are the most atmospheric times. The pools sit in a frame of mangroves with the lights of the town visible across the bay. There's no swimming pool feel — wooden walkways link the pools and the surrounding tangle of mangrove forest looks much as it always has.