Lough Shark is labelled 14 on the map.

The lake was described twice in 1838 in the Ordnance Survey Memoirs:

"The parish [of Ballymore] contains no lakes of any considerable magnitude. The following are contained in it: nearly the western half of Lough Shark, situated half a mile to the eastward of the village of Acton, its remaining or eastern portion being in the county of Down. It is elevated to the height of 80 feet above the level of the sea and its dimensions are as follows: extreme length from north north east to south south west half a mile, and extreme breadth from east south east to west north west a third of a mile."

"Lough Shark, partly in this county and partly in the county of Down, is 80 feet above the sea and is the summit level of the Newry Canal. 33 acres of the lake are in this parish and county."