Portumna (Irish: Port Omna - meaning 'the landing place of the oak') is a market town in the south-east of County Galway, Ireland, on the border with County Tipperary. The town is located to the west of the point where the River Shannon enters Lough Derg. This historic crossing point over the River Shannon between counties Tipperary and Galway has a long history of bridges and ferry crossings. On the west side of the town is Portumna Castle and its forest park.