Shannon Estuary in the context of "Kerry Head"

Shown here are all the major rivers and tributaries of Ireland with their lengths (in kilometres and miles). Starting with the Northern Ireland rivers, and going in a clockwise direction, the rivers (and tributaries) are listed in regard to their entry into the different seas: the Irish Sea, the Celtic Sea and the Atlantic Ocean. Also shown are two tables. Table 1 shows the longest rivers in Ireland with their lengths (in kilometres and miles), the counties they flow through, and their catchment areas (in square kilometres). Table 2 shows the largest rivers in Ireland (by mean flow) in cubic metres per second.

The longest river in Ireland is the River Shannon, at 360.5 kilometres (224.0 mi). The river develops into three lakes along its course, Lough Allen, Lough Ree and Lough Derg. Of these, Lough Derg is the largest. The Shannon enters the Atlantic Ocean at the Shannon Estuary. Other major rivers include the River Liffey, River Lee, River Swilly, River Foyle, River Lagan, River Erne, River Blackwater, River Nore, River Suir, River Barrow (The Three Sisters), River Bann, River Slaney, River Boyne, River Moy and River Corrib.

The River Shannon (Irish: an tSionainn, Abhainn na Sionainne or archaic an tSionna) is the major river on the island of Ireland, and at 360 km (224 miles) in length, is the longest river in the British Isles. It drains the Shannon River Basin, which has an area of 16,900 km (6,525 sq mi), – approximately one fifth of the area of Ireland.

Known as an important waterway since antiquity, the Shannon first appeared in maps by the Graeco-Egyptian geographer Ptolemy (c. 100 – c. 170 AD). The river flows generally southwards from the Shannon Pot in County Cavan before turning west and emptying into the Atlantic Ocean through the 102.1 km (63.4 mi) long Shannon Estuary. Limerick city stands at the point where the river water meets the sea water of the estuary. The Shannon is tidal east of Limerick as far as the base of the Ardnacrusha dam. The Shannon divides the west of Ireland (principally the province of Connacht) from the east and south (Leinster and most of Munster; County Clare, being west of the Shannon but part of the province of Munster, is the major exception.) The river represents a major physical barrier between east and west, with fewer than thirty-five crossing points between the village of Dowra in the north and Limerick city in the south.

Limerick (/ˈlɪmərɪk/ LIM-ər-ik; Irish: Luimneach [ˈl̪ˠɪmʲ(ə)nʲəx]) is a city in western Ireland, in County Limerick. It is in the province of Munster and is in the Mid-West which comprises part of the Southern Region. With a population of 102,287 at the 2022 census, Limerick is the third-most populous urban area in Ireland, and the fourth-most populous city on the island of Ireland. It was founded by Scandinavian settlers in 812, during the Viking Age.

The city straddles the River Shannon, with the historic core of the city located on King's Island, which is bounded by the Shannon and Abbey Rivers. Limerick is at the head of the Shannon Estuary, where the river widens before it flows into the Atlantic Ocean. Limerick City and County Council is the local authority for the city.

County Kerry (Irish: Contae Chiarraí) is a county on the southwest coast of Ireland, within the province of Munster and the Southern Region. It is bordered by two other counties; Limerick to the east, and Cork to the south and east. It is separated from Clare to the north by the Shannon Estuary. With an area of 4,807 square kilometres (1,856 sq mi) and a population of 156,458 as of 2022, it is the 5th largest of Ireland's 32 counties by land area, and the 15th most populous. The governing local authority is Kerry County Council.

Bounded by the Atlantic Ocean, Kerry is Ireland's most westerly county. Its rugged coastline stretches for 886 kilometres (551 miles) and is characterised by bays, sea cliffs, beaches and many small offshore islands, of which the Blaskets and the Skelligs are the most notable. The county's peninsulas have a hilly to mountainous topography, with the MacGillycuddy's Reeks on Iveragh rising to over 1,000 m (3,300 ft). By contrast, its interior regions are mostly flat, interspersed with low mountain ranges such as the Stacks and the Mullaghareirks. The climate of Kerry is dominated by the North Atlantic Current and is usually mild and humid, with abundant precipitation. This allows for the growth of a wide variety of temperate and sub-tropical plants not typically found at such northerly latitudes.

This is a list of crossings of the River Shannon, in Ireland (including bridges, tunnels, ferries and fords), from its source in the Shannon Pot to the Shannon Estuary where the river widens before it flows into the Atlantic Ocean. Bridges not primarily intended for public use but which have limited access (generally only in the daytime and only for bicycle and foot traffic) are not included.