- Source: Tablas Island Blue Hole
The Tablas Island Blue Hole is an underwater sinkhole located off northeast Tablas Island below the Gorda Point Lighthouse, a historic lighthouse located about 248 kilometers (154 mi) southeast of Manila in Barangay Cawayan, San Agustin, Romblon, Philippines.
Description
It is a vertical chimney about 8 metres (26 ft) in diameter, and is the only known blue hole in the Philippines. With an entrance in shallow water, it is possible to free-dive into the top part of the hole. The bottom of the hole is at a depth of about 30 meters.