Lake Balanan is a lake situated in

Siaton Siaton ( ceb, Lungsod sa Siaton; tl, Bayan ng Siaton), officially the Municipality of Siaton, is a 1st class municipality and the southernmost settlement in the province of Negros Oriental, Philippines. According to the 2020 census, it has a po ...

Negros Oriental Negros Oriental ( ceb, Sidlakang Negros; tl, Silangang Negros), officially the Province of Negros Oriental, is a province in the Philippines located in the Central Visayas region. Its capital is the city of Dumaguete. It occupies the southeaste ...

in the

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 ...

. It is a freshwater lake in the forested mountains of the southern portion of the island of Negros, with a shape resembling a figure of eight, the narrowest point between the two main portions of the lake being only wide. The lake is surrounded by mountain ranges, and is fed by three

tributaries A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainag ...

, all located in the northern end. These are the Lamarao Creek at the northeastern corner with two waterfalls, the Balanan Creek at the middle of the northern end with another waterfall, and the Nasig-id Creek at the northwestern end. The lake has a humid

tropical climate Tropical climate is the first of the five major climate groups in the Köppen climate classification identified with the letter A. Tropical climates are defined by a monthly average temperature of 18 °C (64.4 °F) or higher in the cool ...

with two pronounced seasons, a dry season from November to April and a wet season for the rest of the year. The lake was formed by a

tectonic earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

with the magnitude of a 6.8 on the

Richter scale The Richter scale —also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale—is a measure of the strength of earthquakes, developed by Charles Francis Richter and presented in his landmark 1935 ...

that hit the southern portion of the island of Negros, and caused landslides in the southern ends of both the Balanan and Nasig-id ranges in Siaton. The fallen rocks and soil dammed the Balanan River that flowed between these mountain ranges forming a " humerus" bone-formed lake oriented along the Northwest-Southeast line. The lake and surrounding

forests A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...

are currently being managed as a Watershed Area by the Bureau of Forest Development. A proposal has been made to designate the area as a Game Refuge and Wildlife Sanctuary to protect the large population of bats and other wildlife. This proposal was endorsed by the

Department of Environment and Natural Resources The Department of Environment and Natural Resources ( fil, Kagawaran ng Kapaligiran at Likas na Yaman, DENR or KKLY) is the executive department of the Philippine government responsible for governing and supervising the exploration, developmen ...

, Region 7, in January 1987.

History

At 5 pm on May 5, 1925, the town of

was hit by an earthquake that registered 6.8 on the Richter Scale. The quake triggered a landslide that created a natural dam. The dam, called ''Sampong'' (meaning "to close"), blocked the flow of Balanan River, turning it into a lake.

References

External links

* Geographic data related t
Lake Balanan
at OpenStreetMap {{Lakes of the Philippines Balanan Landforms of Negros Oriental