Westwater Reservoir is an artificial reservoir in the Pentland Hills, Scottish Borders, 3 km west of West Linton, and 26 km south west of Edinburgh. It forms part of the Lothian region water supply and is located 320 m above sea level.Due to its popularity with pink-footed geese (Anser brachyrhynchus) it has been designated as a Special Protection Area and a Ramsar site.