Lough Derg ( ) is the
third-largest lake (or lough) in Ireland (after
Neagh and Lough
Corrib) and the second-largest in the Republic of
Ireland. It is a long, relatively narrow lake, with
shores in counties North Tipperary
(to the east), Galway
(north-west), and Clare
(south-west). The lake is the last of three on the River Shannon, with the other two, Lough Ree and Lough
Allen lying further north. Some towns or villages on Lough Derg
include Garrykennedy, Portumna, Killaloe & Ballina, Dromineer, Terryglass and Mountshannon.
At its deepest, the lake is 36 metres deep and covers an area
of 118 km²
(45.5 sq miles).
The lake is a popular place for leisure boating
. At the point where Lough Derg empties into
the Shannon, it slopes steeply downhill—a major reason for the
location of the world's then-largest hydroelectric power plant at Ardnacrusha in 1927.
nineteenth century, Lough Derg was an important artery from the
port at Limerick to Dublin through the
canals in the midlands of Ireland.
Navigable over its full
40 km length, Lough Derg is today popular with cruisers and other
pleasure traffic, as well as sailing
. The University of Limerick have an activity centre by the lake, just outside
It is used for canoes
, among other purposes.
- International Lake Environment Committee
- Waterways Ireland ePortal