| Loch Lyon | |
| Location: | Glen Lyon, Perth |
| Coordinates: | 56.5408°N -4.568°W |
| Type: | freshwater loch, reservoir |
| Outflow: | River Lyon |
| Basin Countries: | Scotland |
| Length: | 2.81km (01.75miles) |
| Width: | 0.4km (00.2miles) |
| Area: | 492.3ha |
| Depth: | 25feet before construction of dam. |
| Max-Depth: | 100feet before construction of dam. |
| Shore: | 21.2km (13.2miles) |
| Elevation: | 344m (1,129feet) |
| Pushpin Map: | Scotland Perth and Kinross |
Loch Lyon (Scottish Gaelic, Loch Lìobhann)[1] is a freshwater loch in Glen Lyon, located in Perthshire, Scotland, which feeds the River Lyon, a tributary of the River Tay.[2] [3] Loch Lyon lies in Glen Lyon, that is the longest enclosed Glen in Scotland, stretching over 30-1NaN-1 from Fortingall in the east to Loch Lyon in the west. Sir Walter Scott described Glen Lyon as the longest, loneliest and loveliest glen in Scotland.[4]
The original natural loch was much expanded by a hydro-electric dam, part of the North of Scotland Hydro-Electric Board's Breadalbane scheme.