the Municipality of Ayungon, on the East by Tañon Strait, and on the West by the City
of Himamaylan, Negros Occidental. The land area of Tayasan is 184.8524 square
kilometers or 18,485.24 hectares. It is subdivided into barangays, it has a population
35,470 (2015 NCSO Survey) with voting population 23, 900 (2019 COMELEC). In
2005, Tayasan became a third- class Municipality within the first Congressional
District of Negros Oriental, Region VII, Regional Center in Cebu City.
Climatic Conditions
The climate of Tayasan is generally tropical at the macro level with two seasons, though
not well pronounced, the dry and wet. Negros Island especially the greater portion of
Northern Negros, including Tayasan, have a type III climate, meaning seasons not very
pronounced: relatively dry from November to April and wet during the rest of the year.
The mountain ranges that occupy almost the whole center of Negros Island from the
north to south, also influence the micro climatic conditions of the Municipality
especially at the hinterland. The Municipality is relatively dry from the month of
November to April, and wet during the rest of the year. The Siberian cold normally hit
the Municipality in the months of January to February, making it the coldest months of
the year.
The month of March and April is considered the real dry months, with only 1.5 to 2.0
inches amount of rainfall. Rainfall ranges from 1.5 to 2.5 inches during dry season.
Northeast monsoon is the prevailing wind direction found in the Municipality. The
presence of Cebu Province across Tañon Strait partly shields the Municipality from the
prevailing north wind, the southeast monsoon and the cyclonic storms that intermittently
visit Negros Island, sometimes hit the Municipality. Tayasan, however is not within the
typhoon path.
Topography
The Municipality of Tayasan forms an elongated rectangle that runs approximately 28
kilometers westward up to boundary of Negros Occidental. In between are serrated
mountains ranges the portions of which, like Palaslan are close to the shoreline. At the
center of the Municipality are volcanic mountains, with steep slopes; brought about by
the two big rivers the Jilabangan and Tibyawan river moves towards Negros Occidental.
Plains are found at the coastal areas, extending from Matuog to Lutay. Alluvial Plains
and Plateaus are also found at Tambulan and its surrounding areas, settlements are
normally found in these areas.
Slope
The two-river system that traverses the Municipality as previously mentioned, exhaust
to Tañon Strait, between Palaslan and Poblacion, Boulders and gravels are brought to
the tidal flats in the coastal areas. At the hinterland these, rivers cause a topography that
is characterized by steepy undulating lands, hilly land, valleys and plateaus that are
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