This wildlife sanctuaryhas an area of 4.11 hectaresand is located at the eastern section of City of Mati. It is situated at an elevation of 1,160 meters above sea level.
This lake holds water during the rainy season but disappears during the dry season, hence its name. Folkloric tale disclosed that the locals considered Tinagong Dagat as a mythical sea on top of the mountain as they observed high and low tide scenes. The site has a total surface area of 7,132.76 hectares. It is clearly definedon the ground, which consists of 6,348.99 hectaresof core zone and 783.77 hectaresof buffer zone.