Seven Lakes of San Pablo
The Seven Lakes of San Pablo (Filipino: Pitong Lawa ng San Pablo) are scattered around the City of San Pablo, Laguna, Philippines.
The lakes are craters of ancient volcanoes and are among the 20 small monogenetic volcanic fields found along the Macolod Corridor, which is part of the larger Southwestern Luzon Volcanic Field,[1] or San Pablo Volcanic Field.
These are maar craters formed by phreatomagmatic eruptions, when ground water comes in contact with hot magma pushing up near the Earth's surface.[1]
Water Content
In the monitoring of water quality in some lakes and rivers in San Pablo, elevated sulfate concentrations ranges from 2.77 to 328.4 ppm, which were higher than the sulfate values of sediments taken at Indang, Cavite and La Mesa Watershed, which are also right above volcanic rocks (e.g. ignimbrites, tuffs, and pyroclastics) from the paleo-eruptions of distant volcanoes (e.g. Taal volcano).
The Lakes
Conservation
The lakes are threatened by human intervention and exploitation, most especially Lake Sampaloc, which is located right in the center of San Pablo City. Various ecological conservation efforts by both government and non-government organizations, like the Friends of the Seven Lakes Foundation, had been implemented in recent years. One of these is the demolition of human-made structures along the lakes' shoreline.
Notes
- ^ a b "PETROGRAPHIC ANALYSIS OF ROCKS AND SEDIMENTS AROUND THE SEVEN LAKES OF SAN PABLO, LAGUNA: IMPLICATIONS REGARDING SULFATE DISTRIBUTION AND PROVENANCE". Department of Environmental Science, Ateneo de Manila University. Retrieved 2009-04-30.
References
- Website of the City of San Pablo
- About San Pablo City
- Friends of the Seven Lakes Foundation (retrieved: 30 April 2009)
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