Lough Derg, Ireland

In 1887, John Bartholomew's Gazetteer of the British Isles described Lough Derg like this:

Derg, Lough.-- expansion of the river Shannon, between co. Tipperary and cos. Clare and Galway; 24 miles long, with average breadth of 2 miles; greatest depth, 80 ft.; average depth, 30 ft.; is navigable by the river steamers plying between Killaloe and Portumna.

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