Assam has enjoyed a reputation for unspoiled natural beauty, substantial biodiversity, tea plantations, and friendly people. The Brahmaputra, the lifeline of the valley which shares its name, floods the nearby land with fertile silt every year to ensure a rich harvest. It is bound on either side by marshy land covered with thick jungle grass, interspersed with patches of rice fields and terraced tea gardens. There is little to interrupt the vast panorama except the occasional lone hillock. Only in the south of the valley is the even horizon broken by the hills of Karbi Anglong. Further south are the North Cachar Hills. Located here, amid orchards is Assam's only hill station, Haflong. The southern part of Assam is the Barak Valley, this region hosts untouched natural beauty. Green is the dominant colour of the state, with an impressive 35% forest cover and thousands of hectares under tea cultivation. Assam has five national parks including the World Heritage Sites of Kaziranga and Manas, and 20 Wildlife and Bird Sanctuaries. The great Indian one-horned rhinoceros is one of Assam's most noteworthy fauna.