Ducligan Hot Spring lies in Isabela Province on the island of Luzon, Philippines. This open-air thermal source offers a wild bathing experience amid a tropical landscape, away from typical tourist infrastructure.
Insider tip — Ducligan Hot Spring in Isabela province, Cagayan Valley, northern Luzon — natural geothermal spring in the Sierra Madre foothills. Isabela is the Philippines' largest province and part of the Cagayan River basin. Geothermal springs associated with the Philippine fault system in the Sierra Madre range.