A dominant feature of the province of Batangas is Taal Lake. It covers an area of and is drained by Pansipit River down into Balayan Bay. Pansipit is one of the major ecological highways that allow migration of two fish species: maliputo (Cranx ignobilis) and muslo (Cranx marginalis) which are unique to lake Taal. Adult fish migrate to the sea from Taal Lake via Pansipit River and Palanas River in Lemery. The tawilis (Harengula tawilis) is a freshwater sardine also endemic to Taal lake.