The Tullahan River is a river located in the northern part of Metro Manila, Philippines. It flows through several cities, including Quezon City and Valenzuela City, before emptying into Manila Bay. The river is approximately 27 kilometers long and serves as a natural drainage system for the surrounding areas. Historically, the Tullahan River has faced significant pollution and environmental challenges due to urbanization and waste disposal. Efforts have been made by local government units and organizations to rehabilitate the river and improve its water quality, aiming to restore its ecological balance and enhance the quality of life for nearby communities.