<P> Bihar is mainly a vast stretch of very fertile flat land . It is drained by the Ganges River, including northern tributaries of other river The Bihar plain is divided into two unequal halves by the river Ganges which flows through the middle from west to east . Other Ganges tributaries are the Son, Budhi Gandak, Chandan, Orhani and Phalgu . The Himalayas begin at foothills a short distance inside Nepal but influence Bihar's landforms, climate, hydrology and culture . Central parts of Bihar have some small hills, for example the Rajgir hills . The Himalayan Mountains are to the north of Bihar, in Nepal . To the south is the Chota Nagpur plateau, which was part of Bihar until 2000 but now is part of a separate state called Jharkhand . </P> <P> Bihar has notified forest area of 6,764.14 km2, which is 7.1 per cent of its geographical area . The sub Himalayan foothill of Someshwar and Dun ranges in Champaran district another belt of moist deciduous forests . These also consists of shrub, grass and reeds . Here the rainfall is above 1,600 mm and thus promotes luxuriant Sal forests in the favoured areas . The hot and dry summer gives the deciduous forests . The most important trees are Shorea Robusta (Sal), Shisham, Cedrela Toona, Khair, and Semal . This type of forests also occurs in Saharsa district and Purnia district . </P> <P> Bihar is a producer of Steatite (945 tonnes), Pyrites (9,539 tonnes / year), Quartzite (14,865 tonnes / year), Crude Mica (53 tonnes / year), Limestone (4, 78,000 tonnes / year). Bihar has also some good resource of Bauxite in Jamui district, Cement Mortar in Bhabhua, Dolomite in Bhabhua, Glass sand in Bhabhua, Mica in Muzaffarpur, Nawada, Jamui, Gaya and salt in Gaya and Jamui, uranium in Gaya </P> <Table> <Tr> <Td> <Ul> <Li> River <Ul> <Li> Ajay River </Li> <Li> Bagmati </Li> <Li> Budhi Gandak </Li> <Li> Bhutahi Balan </Li> <Li> Gandak </Li> <Li> Ganges </Li> <Li> Ghaghra </Li> <Li> Phalgu </Li> <Li> Gandaki River </Li> <Li> Kamala </Li> <Li> Karmanasha </Li> <Li> Koshi River </Li> <Li> Mahananda River </Li> <Li> Punpun </Li> <Li> Sapt Koshi </Li> <Li> Son River </Li> </Ul> </Li> </Ul> </Td> <Td> </Td> <Td> <Ul> <Li> Waterfall <Ul> <Li> Kakolat Waterfall </Li> <Li> Telhar Waterfall </Li> <Li> Karkat Waterfall </Li> </Ul> </Li> </Ul> </Td> <Td> </Td> <Td> <Ul> <Li> Spring (hydrosphere) <Ul> <Li> Manjhar Kund </Li> <Li> Dhua Kund </Li> <Li> Sita Kund </Li> <Li> Rishi Kund </Li> <Li> North Tank </Li> </Ul> </Li> </Ul> </Td> <Td> </Td> <Td> <Ul> <Li> Lake <Ul> <Li> Anupam Lake </Li> <Li> Kharagpur Lake </Li> <Li> Kanwar Lake </Li> </Ul> </Li> </Ul> </Td> </Tr> </Table>

Which of the following districts of bihar does not share border with nepal