High Quality Content by WIKIPEDIA articles! Laguna de Bay (Filipino: Lawa ng Bay; English: Lake of Bay) is the largest lake in the Philippines and the third largest freshwater lake in Southeast Asia (in terms of surface area) after Tonle Sap in Cambodia and Lake Toba in Sumatra, Indonesia. It is on the island of Luzon between the provinces of Laguna to the south and Rizal to the north. Metro Manila lies on its western shore. Its surface area is 949 square kilometers and has an average depth of only about 2 meters. The lake is shaped like a stylised `W`, with two peninsulas jutting out from the northern shore. Between these peninsulas, the middle lobe fills a large volcanic caldera. Laguna de Bay drains to Manila Bay via the Pasig River. The lake is one of the primary sources of freshwater fish in the country.