<P> Some of the lakes present a danger of a glacial lake outburst flood . The Tsho Rolpa glacier lake in the Rowaling Valley, in the Dolakha District of Nepal, is rated as the most dangerous . The lake, which is located at an altitude of 4,580 metres (15,030 ft) has grown considerably over the last 50 years due to glacial melting . </P> <P> The mountain lakes are known to geographers as tarns if they are caused by glacial activity . Tarns are found mostly in the upper reaches of the Himalaya, above 5,500 metres . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2017) (Learn how and when to remove this template message) </Td> </Tr>

What country is bordered on the north by the himalaya mountains