The Munster Blackwater, also known as An Abhainn Mhór ("the Great River"), rises in the Mullaghareirk Mountains in County Kerry and flows approximately 169 kilometres eastward through Counties Cork and Waterford, passing through Mallow, Fermoy, Lismore, and Cappoquin before emptying into the Celtic Sea at Youghal. The river has earned the informal nickname "Irish Rhine" owing to its wide valley, lush meadows, dense woodlands, and historic castles along its banks.

For paddlers, the calmer sections of the river offer straightforward conditions suitable for kayaking and canoeing. A popular route runs from Lismore to Cappoquin, where paddlers encounter gentle rapids. Another commonly paddled stretch runs from Cappoquin downstream toward Villierstown, with options to continue as far as Ballynatray. The river is described as peaceful along these lower reaches, with views of the Knockmealdown Mountains adding to the landscape.

Several operators provide equipment and guided experiences on the river. Blackwater Boating is based at Cappoquin and offers ICU-approved canoes and kayaks, with packages including upriver canoe-camping trips and exploration of stately homes along the banks. Blackwater Eco Tours operates from Villierstown Quay in County Waterford, offering single and double sit-on-top kayaks and canoes for two-hour self-guided sessions, with life jackets and paddles provided, starting from €15 per kayak. Groups of up to 27 to 30 people can be accommodated by these operators.

Wildlife along the river includes herons, kingfishers, otters, and leaping fish, particularly salmon. The Blackwater is internationally regarded as one of Ireland's premier salmon rivers, with a fishing season running from February to September. Paddlers sharing the water with anglers should be aware of the numerous private and club-managed fishing beats along the river, particularly during the salmon season.

The estuary near Youghal is a protected area notable for birdwatching. The broader river corridor includes walking trails along the banks and historic features visible from the water, including castle ruins and stately homes.