Terryglass Quay sits on the northern shore of Lough Derg, one of the largest lakes on the River Shannon, bordering counties Tipperary, Clare, and Galway.

The quay serves as a public harbour and marina offering overnight mooring, administered by Waterways Ireland, the Shannon navigation authority, with a limit of five consecutive nights.

For boaters cruising Lough Derg, Terryglass is a popular stop near the top of the lough, roughly three hours by water from Garrykennedy.

The surrounding village is one of the oldest settlements in Ireland, tracing its origins to a 6th-century monastery founded by Saint Columba.