The San Cristobal River ( tl, Ilog ng San Cristobal) commonly known as Matang Tubig River is a river system in the cities of Calamba and

Cabuyao Cabuyao, officially the City of Cabuyao ( fil, Lungsod ng Cabuyao), is a 1st class component city in the province of Laguna, Philippines. According to the 2020 census, it has a population of 355,330 people. It used to be known as the "riche ...

, Laguna,

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. The river is one of 21 major tributaries of Laguna de Bay.

Hydrology

The main source of the San Cristobal River is Mount Sungay, the highest mountain of

Cavite Cavite, officially the Province of Cavite ( tl, Lalawigan ng Kabite; Chavacano: ''Provincia de Cavite''), is a province in the Philippines located in the Calabarzon region in Luzon. Located on the southern shores of Manila Bay and southwest ...

province, where the main stem and its tributaries drain the northern and eastern side of the mountain. Its watershed area covers Calamba and

in Laguna,

Tagaytay Tagaytay, officially the City of Tagaytay ( fil, Lungsod ng Tagaytay), is a 2nd class component city in the province of Cavite, Philippines. According to the 2020 census, it has a population of 85,330 people. It is one of the country's most po ...

and municipality of Silang in

. The river system of San Cristobal from Mount Sungay is connected to the Matang Tubig located in Casile and

Canlubang Canlubang is a major industrial zone located in the province of Laguna, southwest of Metro Manila in the Philippines. It was once a hacienda during the Spanish colonial period. Canlubang straddles two component cities of Laguna: Cabuyao, Calamba ...

Water quality

Along with the San Juan River, the two rivers act as natural drainage systems by receiving and conveying Calamba's (and Cabuyao's for San Cristobal) liquid wastes and storm surface runoff to the nearby Laguna de Bay. Both rivers are very polluted as a result, thus, affecting the water quality of the lake as well. Although a 1991 study cited the San Pedro River and Morong River as the sources of

eutrophication Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytopla ...

-causing minerals in Laguna de Bay, the

Laguna Lake Development Authority The Laguna Lake Development Authority (LLDA), one of the attached agencies of the Department of Environment and Natural Resources (DENR), is responsible for the preservation, development, and sustainability of Laguna de Bay (Laguna Lake) and its ...

(LLDA) has noted that more recent deterioration of the San Cristobal River in Calamba have made it one of the lake's major sources of nutrient loading. The LLDA's conservation efforts for the major tributaries and watersheds of Laguna de Bay have led to the creation of the

Laguna de Bay River Basin Councils Laguna (Italian and Spanish for lagoon) may refer to: People * Abe Laguna (born 1992), American DJ known as Ookay * Andrés Laguna (1499–1559), Spanish physician, pharmacologist, and botanist * Ana Laguna (born 1955), Spanish-Swedish ballet d ...

, of which the San Cristobal River Enhancement Defenders (SACRED) is particularly tasked with conservation of the San Cristobal.

References

Rivers of the Philippines Tributaries of Laguna de Bay Landforms of Laguna (province) {{Philippines-river-stub

Hydrology

Water quality

See also

References