Laguna de Baý (; ) is the largest lake in the Philippines located east of Metro Manila between the provinces of Laguna to the south and Rizal to the north. The freshwater lake has a surface area of 911–949 km² (352-366 sq mi), with an average depth of about and an elevation of about above sea level. The lake is shaped like a stylized 'W', with two peninsulas jutting out from the northern shore. Between these peninsulas, the middle lobe fills the large volcanic Laguna Caldera. In the middle of the lake is the large island of Talim, which falls under the jurisdiction of the towns of Binangonan and Cardona in Rizal province.