Wawa River refers to two rivers:

Wawa River located in Rodriguez, Rizal

Rodriguez, Rizal

Rodriguez, Rizal is a first-class, urban municipality in the province of Rizal, Philippines. It is the northernmost town in the province and comes after San Mateo, Rizal, and Quezon City coming from Metro Manila...

, Philippines

Philippines

The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

 is the name of the headwaters of Marikina River

Marikina River

The San Mateo - Marikina River is a main river system in Eastern Metro Manila, Philippines. A river stretching from Rodriguez, Rizal, to Pasig City that connects to Pasig River as major tributary near Napindan Area in Pasig City.San Mateo - Marikina River used to be an important transport route...

, a few kilometers north of the capital city Manila

Manila

Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

. The Wawa Dam was created during the American era to serve the water needs of Metro Manila

Metro Manila

Metropolitan Manila , the National Capital Region , or simply Metro Manila, is the metropolitan region encompassing the City of Manila and its surrounding areas in the Philippines...

. It used to be the only source of water for Manila until Angat Dam

Angat Dam

Angat Dam is a concrete water reservoir embankment hydroelectric dam that supplies the Manila metropolitan area water. It was a part of the Angat-Ipo-La Mesa water system...

 was built and Wawa was abandoned. Due to insufficiency of the water supply for Metro Manila, there is a strong clamor to reuse the dam.

The Wawa River (Rio Wawa) (or Rio Hauhau) (affluent of the Caribbean Sea

Caribbean Sea

The Caribbean Sea is a sea of the Atlantic Ocean located in the tropics of the Western hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles, and to the east by the Lesser Antilles....

) flows southeast through northeast Nicaragua to the Mosquito Coast (or Miskito Coast) region.