It rises in the Lowther Hills at Tweed's Well near to where the Clyde, draining northwest (10 kilometres (6.2 mi) from the Tweed's Well), and the Annan draining south (1.9 kilometres (1.2 mi) from the Tweed's Well) also rise. "Annan, Tweed and Clyde rise oot the ae hillside" is a saying from the Border region.[4] East of Kelso, it becomes a section of the eastern part of the border.