It is located on the Dingle Peninsula in County Kerry.

It is about 30 km (19 mi) west of Tralee, near the village of Castlegregory.

[1] Lough Gill is considered a natural lagoon, draining into Tralee Bay.

[3] Fish species in Lough Gill include three-spined stickleback, sand goby, brown trout, flounder and the critically endangered European eel.

[3] The lake is part of the Tralee Bay and Magharees Peninsula, West to Cloghane Special Area of Conservation.