The Nuttall Encyclopedia
The largest lake in the British Isles, lies in the NE. of Ireland, touching the borders of five counties, is 16 m. long, and has an average breadth of 10 m. and a greatest depth of 102 ft.
Wood, James, ed. Entry for 'Neagh, Lough'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/n/neagh-lough.html. Frederick Warne & Co Ltd. London. 1900.