Shannon Estuary

The Shannon broadens into a long tidal estuary between the shores of Clare and Kerry before meeting the Atlantic. Islands, creeks and sheltered anchorages break up its waters, while the river continues inland to Limerick. For ships bound to the city, the estuary was the gateway between the ocean and the commerce of the Shannon valley. Its entrance lies between exposed headlands, and vessels must contend with wind and tide before reaching the more protected water farther upstream. Control of this route mattered to the port of Limerick in peace and war.