The Kells Blackwater is one of Ireland's finest wild brown trout rivers and holds the distinction of being the largest tributary of the River Boyne. Fed by Lough Ramor in County Cavan, it flows in a south-easterly direction, passing north of Kells in County Meath before joining the Boyne at Navan. The river drains a substantial catchment of 735 km², and its limestone character gives it the rich, fertile water quality that supports exceptional wild trout populations. As a classic limestone river, the Kells Blackwater carries all the hallmark fly hatches associated with this water type — sedges and olives being particularly important — and its clear, productive waters have earned it a well-deserved reputation among fly anglers throughout Ireland and beyond.