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The West Philippine Basin is deeper and older than the eastern basins and has crustal heat-flow values approaching that of old oceanic crust. [ 3 ] [ 4 ] It is roughly bisected by the Central Basin Fault zone which comprises a band of high relief running from the northwest corner to the Kyushu–Palau Ridge near 14°N.
18 Major River Basins in the Philippines. Rivers in the Philippines are grouped into 18 major river basins. Of these, the Cagayan, the country's longest river, [1] has the largest drainage basin, followed by the Mindanao, the Agusan, and the Pampanga. [2]
The basin sees an average of about seven cyclones each year, although more can form or come in from other basins, such as the South Pacific. [ 6 ] [ 33 ] [ 34 ] The tropical cyclone Cyclone Vance in 1999 produced the highest recorded speed winds in an Australian town or city at around 267 km/h (166 mph).
The watershed area can then be estimated using a planimeter, by overlaying graph paper and counting grid cells, or the result can be digitized for use with mapping software. The same process can be done on a computer, sketching the watershed boundary (with a mouse or stylus) over a digital copy of a topographic map. [ 1 ]
The Philippines is an archipelago that comprises 7,641 islands, [8] and with a total land area of 300,000 square kilometers (115,831 sq mi), it is the world's fifth largest island country. [ 2 ] [ 3 ] [ 9 ] The eleven largest islands contain 95% of the total land area.
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China has accused the Philippines of setting off the hostilities in the disputed waters by encroaching in what it says are its offshore territories, demarcated by 10 dashes on a map.
Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, [3] [4] and impluvium. [ 5 ] [ 6 ] [ 7 ] In North America, they are commonly called a watershed , though in other English-speaking places, " watershed " is used only in its original sense, that of the drainage divide line.