Lough Inagh (Irish: Loch Eidhneach, meaning 'lake of the place of ivy')[1] is a freshwater lake in the Inagh Valley, in Connemara, County Galway, in the west of Ireland.

The bulk of the Maumturks range and its long central spine lies to the east of the lake, with two highest peaks of Letterbreckaun 677 metres (2,221 ft) and Binn idir an Dá Log 702 metres (2,303 ft), also overlooking the Lough.

[2][3] Lough Inagh is fed from several mountain streams in the area, but most importantly from the Gleninagh River that starts high up in the Gleninagh Valley on the slopes of Benbaun and Bencollaghduff, and the Tooreennacoona River.

[3][4] Lough Inagh is noted for its lake and river fishing with spring salmon, grilse and sea trout (depending on season), and the fishing is mostly done from boats, however, the lake is too big for rowing and an outboard motor is recommended (there are a couple of submerged rocks so caution should be taken).

[7] The northernmost end of the Lough, just beside Bencorrbeg 577 metres (1,893 ft), has views into the Gleninagh Valley (Irish: Gleann Eidhneach, meaning "Valley of Ivy"), from which the Lough derives its name; the south wall of the valley is the impressive Carrot Ridge rock-climbing location, while at the head of the valley are Bencollaghduff 696 metres (2,283 ft), and the highest peak in the Twelve Bens range, Benbaun at 729 metres (2,392 ft).