Daer Reservoir is a man-made waterbody created by the damming of the Daer Water, a tributary of the River Clyde in the Southern Uplands of Scotland. It lies within the Lowther Hills in South Lanarkshire. A minor public road leaving the A702 follows the Daer Water south to the dam and then continues along the western margin of the reservoir as far as Kirkhope. The reservoir was officially opened by HM Queen Elizabeth in 1956 to supply water to the Scottish Central Belt.
Season tickets for fishing in the reservoir for brown trout are available from Kilbryde Angling Club. The Southern Upland Way passes just to the north of the dam and affords views over the reservoir for the walker. 
- Ordnance Survey 1:25,000 scale Explorer map sheet no 329 Lowther Hills, Sanquhar & Leadhills