Geological Background
Its area is 1,652 km2 (638 sq mi): 35 km2 (14 sq mi) is water and 1,617 km2 (624 sq mi) is land. Galle District bounded on the north by Benthara river, south and west by the Indian Ocean and east by Matara and Ratnapura districts. The topography of Galle District is very much dissent. The climatic condition of Hiniduma Patthuwa is very similar to the central hill country of Sri Lanka. This area consists of rainforests, which is the water catchment area for most of the rivers and lakes flows across Galle District. Sinharaja Forest Reserve is one of them. Galle district lies in a temperate climatic zone.
Annual rain fall is between 2000-2500mm. The river Gin River ("Gin Ganga") starts from Gongala Hill of Hiniduma Patthuwa and in its long journey of 113 km (70 mi). It passes Neluwa, Thawalama, Nagoda Baddegama and Thelikada areas. The river nourishes the land in extent of 922 km2 (356 sq mi). It flows to the Indian Ocean in Ginthota area of Galle District. The river Madu Ganga starts from Polathu Kanda and flows to the sea from Balapitiya and helps to maintain ecological balance in the Galle district.
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