Geography and Climate
Gunung Leuser National Park in the north of the island is 150 km long, over 100 km wide and is mostly mountainous. 40% of the park is steep, and over 1,500 m. 12% of the Park only, in the lower southern half, is below 600 meters but for 25 km runs down the coast. Eleven peaks are over 2,700 m and the highest point is Gunung Leuser reaching 3,466 metres. The area surrounding Gunung Leuser is known as the Leuser Ecosystem.
Kerinci Seblat National Park in the centre extends 350 km down the back of the Bukit Barisan, averaging 45 km width and 2000 m above sea level. The northern half has a lower eastern mountain range, between 800–1500 m. Three quarters of the park is steep. The highest point, and highest volcano in Indonesia, is the Mount Kerinci, standing at 3,805 m.
Bukit Barisan Selatan National Park is also 350 km long but only 45 km wide on average. The northern two-thirds are rocky, averaging 1,500 m with the highest point, Mount Pulung standing at 1,964 m. The southern half is lower; 90 km of it is a cape and the Park borders the sea for half its length. Many of rivers derive in the Parks and there are several lakes and hot springs.
The mountains have year-round little changing high temperatures, high humidity and high rainfall for 9 months in wetter areas, 7 months in drier areas. This climate has encouraged the high speciation (formation of new species) and variety of species. Gunung Leuser, receives 3000 mm of rainfall, in the north, and collects 4657 mm in the lowland south. Temperatures average between 21 °C to 28 °C and the humidity is always above 60%, especially when over 1700 m. In Kerinci Seblat, the rainfall averages 2990 mm, temperatures range from 16° to 28 °C and humidity is always high (77-90%). In Bukit Barisan Selatan, the rocky west is wet especially during the November to May monsoon: rainfall is 3000–4000 mm. The east is drier, with 2500–3000 mm of rainfall and the temperature ranging between 20°and 28 °C.
Read more about this topic: Tropical Rainforest Heritage Of Sumatra
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