The River Fergus is a river located in County Clare, Ireland. It flows for approximately 30 kilometers, starting near the town of Ennis and eventually emptying into Lough Derg, which is part of the River Shannon system. The river is known for its scenic beauty and is surrounded by lush landscapes. The River Fergus is significant for both its ecological and recreational value. It supports various wildlife species and offers opportunities for activities such as fishing and kayaking. The river also plays a role in local history and culture, contributing to the charm of the surrounding communities.