Assam is a state in north eastern India. Located south of the eastern Himalayas, Assam is known for Assam tea and Assam silk. Assam has a unique landscape with sprawling tea gardens and unending stretches of paddy fields interspersed with groves of coconut, areca nuts, and banana trees. The first oil well in Asia was drilled here. The state has conserved the one-horned Indian rhinoceros from near extinction, along with the pygmy hog, tiger and various species of Asiatic birds. It provides one of the last wild habitats for the Asian elephant. The Assamese economy is aided by wildlife tourism, centred around Kaziranga National Park and Manas National Park which are World Heritage Sites. Sal tree forests are found in the state, which as a result of rainfall looks green all year round. Assam receive more rainfall compared to most part of India. This rain feeds the Brahmaputra River, whose tributaries and oxbow lakes provide the region with a hydro-geomorphic and aesthetic environment.