One of the main rivers of the Philippines, the Pasig River, was once praised for its beauty. It encompasses many smaller rivers and tributaries, six subbasins, and Manila Bay. It is the primary river supporting the area known as Metro Manila, the capital city of Manila, and its surrounding metropolis. Since the end of World War II, the Pasig River has been the primary recipient of much of the pollution produced by Metro Manila’s ten million inhabitants, contributing to water pollution in the Philippines.