It is quite visible and is situated in a low-lying area close to the B742 road between the farms and dwellings of Trees, Lochfergus and Bowmanston in the Parish of Ayr, South Ayrshire, Scotland.

The ground running towards Mossend Farm is marshy and prone to extensive flooding, indicating the previous extent of the loch.

[3] The roughly oval island, around 190 yards (170 metres) long and 0.814 hectares (2 acres) in area, is said to have been reached by a causeway, no longer extant, that ran from the bank near Lochfergus Farm.

The island is designated by the Scottish Wildlife Trust as a Local Nature Conservation Site (LNCS) and maps show that it has long been covered in woodland.

It is recorded in the "Chronicles of Scotland" of 1624 that a friary existed on the island and Love[8] refers to local placenames such as Abbothill and Friarland in support of this.

Nothing now remains of the Kennedys' hunting lodge, recorded as "an old ruined castle... which probably was used as a shooting station by the Cassillis family" which is said, in 1837, to have stood near the margin of Loch Fergus near the track running off the B742.

[3][10] An old trackway known as the "Foul Calsey" or causeway used to run from Loch Fergus past Trees, Macnairston, and Crofthead to Ayr, joining the Cumnock Road near Holmston.

[13] Highpark or Laighpark is a roughly circular earthwork of unknown date or purpose, situated on the slopes to the northeast of the loch.