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Horton Plains is located on the southern plateau of the central highlands of Sri Lanka.[2] The peaks of Kirigalpoththa (2,389 m (7,838 ft)) and Thotupola Kanda (2,357 m (7,733 ft)), the second and the third highest of Sri Lanka, are situated to the west and north respectively. The park's elevation ranges from 1,200-2,300 m (3,900-7,500 ft).[3] The rocks in the park belong to the Archean age and to the high series of the Precambrian era and are made up of Khondalites, Charnockites and granitic gneisses.[4][5] The soil type is of the red-yellow podsolic group and the surface layer is covered with decayed organic matter.[4]
The mean annual rainfall is greater than 2,000 mm (79 in). Frequent cloud cover limits the amount of sunlight that is available to plants. The mean annual temperature is 13 °C (55 °F) but the temperature varies considerably during the course of a day, reaching as high as 27 °C (81 °F) during the daytime, and dipping as low as 5 °C (41 °F) at night. During the southwest monsoon season, the wind speed sometimes reaches gale force. Although some rain falls throughout the year, a dry season occurs from January-March. The ground frost is common in February. Mist can persist for most of the day during the wet season.[6] Many pools and waterfalls can be seen in the park, and Horton Plains is considered the most important drainage basin in Sri Lanka.[2] The Horton Plains are the headwaters of important rivers such as the Mahaweli, Kelani, and Walawe.[2] The plains also feeds Belihul Oya, Agra Oya, Kiriketi Oya, Uma Oya, and Bogawantalawa Oya.