Portrun is a lakeside village, located on the bank of Lough Ree

Lough Ree

Lough Ree is a lake in the midlands of Ireland, the second of the three major lakes on the River Shannon. Lough Ree is the second largest lake on the Shannon after Lough Derg. The other two major lakes are Lough Allen to the north, and Lough Derg to the south, there are also several minor lakes...

 on the River Shannon

River Shannon

The River Shannon is the longest river in Ireland at . It divides the west of Ireland from the east and south . County Clare, being west of the Shannon but part of the province of Munster, is the major exception...

 in Co. Roscommon.

It has mooring facilities for boats, and is a popular resort in the Summer months.
St. Ciarán's holy well is located here and it is said that he often stopped in Portrun here on the way to the sanctuary of Quaker Island, where the ruins of seven churches can still be seen today.