The largest lake in the Philippines and the third largest inland freshwater lake in Southeast Asia, after Lake Tonle Sap in Cambodia and Lake Toba in Sumatra, Indonesia, is Laguna de Bay, also known as Laguna Lake.

An excerpt from the article 24 facts about Philippines

It is located southeast of Manila, the country's capital, on the island of Luzon. It is a freshwater lake with an area of 911-949 square kilometers, an average depth of about 2.8 meters, and an elevation of about 1 meter above sea level. Connected to Lago de Bay is Manila Bay, on the shores of which lies the capital Manila.

The lake is shaped like a chicken's foot, with two peninsulas jutting out from the northern shore, and it largely fills the large volcanic caldera Laguna (Laguna Caldera - a potentially volcanically active caldera and geographic depression in Rizal). In the middle of the lake is the large island of Talim.

Laguna de Bay is one of the country's main sources of freshwater fish. As a shipping route for passenger ships, the lake has been used since Spanish colonial times. It is also the source of water for the Kalayaan hydroelectric project.