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 miles in length from here and has a surface area of approximately seven 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.