The name of the lake is from the Gaelic language, in which it is known as Loch Eireachd.
The village of Dalwhinnie sits at the north east end of the loch. The loch stretches 14½ in length from here and has a surface area of approximately 7 square miles. Loch Ericht is the tenth largest freshwater loch in the Highlands and has a good reputation for its trout fishing.
The loch is part of a hydro-electric scheme and is dammed at both ends. Water flows into the northern end via the Cuaich Aqueduct. The southern end is linked to a hydro-electric power station at Loch Rannoch by the four-mile long River Ericht. The northern dam protects the village of Dalwhinnie from flooding.
Loch Ericht is surrounded by a number of Munros, including Ben Alder (3,766 feet) and Geal-Chàrn (3,714 feet). Traditional hunting areas border the loch. These are called forests; the chief of which is Ben Alder Forest.