Riverside Island Marina is a private, gated marina occupying a scenic position on the River Lark near Isleham, Ely, in Cambridgeshire.

Set within landscaped parklands with views across the Cambridgeshire fenlands, it offers moorings for over 100 boats, including narrowboats and live-aboards, with options ranging from long-term berths to short overnight stops.

Access by road is from the village of Isleham; visitors park before the bridge and arrange gate entry on arrival.

The marina sits roughly a mile from Isleham village and provides a quiet base for exploring the River Lark and the surrounding fenland countryside.