Derryinver Quay sits on Derryinver Bay within Ballinakill Harbour on the Renvyle Peninsula in Connemara, County Galway.

The quay serves local boats, which are known to dry out alongside it at low tide, and acts as a departure point for coastal cruises and wildlife safaris into the waters of the western Atlantic.

The surrounding bay offers anchorage in depths of around 2 metres southwest of the pier, with additional options at the northeast end of the bay. In strong southeasterly winds, mariners typically move to the south side of Derryinver Bay for better shelter.

The small inlet south of nearby Roeillaun island, accessible at half tide, provides the most protected anchorage in those conditions.