The waters originate on Lammermuir, on the slopes of Clints Dod on Dunbar Common, from which runs a burn named Thorter Burn which becomes the Whittinghame Water. The Biel as such and by that name begins from the junction of the Whittinghame Water with the Luggate Burn at Ruchlaw Mains.
From the Luggate Burn, the Biel runs through the Biel Estate, at Bielmill, Bielhill and Biel. Below the estate the river turns northwest for a mile and a half before passing beneath the A1 and the main railway line and thence to West Barns and into Belhaven Bay, with its rather unusual bridge, just west of Dunbar.
- The floods of 12 August 1948, in South-East Scotland, Author: A. T. A. Learmonth, publ. in Scottish Geographical Journal, Volume 66, Issue 3 and 4 December 1950, pages 147 - 153