River Shannon

The River Shannon (Irish: an tSionainn, Abhainn na Sionainne or archaic an tSionna) is the biggest river on the island of Ireland. It is 360 km (224 miles) long, making it the longest river in the British Isles. The river drains the Shannon River Basin, which covers 16,900 km² (6,525 sq mi). This area is about one-fifth of Ireland's total size.

The Shannon has been an important waterway for thousands of years. It was first shown on maps by the Graeco-Egyptian geographer Ptolemy around 100 to 170 AD. The river flows south from the Shannon Pot in County Cavan. It then turns west and empties into the Atlantic Ocean through the Shannon Estuary. The city of Limerick is where the river meets the sea.

The Shannon divides western Ireland, mainly the province of Connacht, from the eastern and southern parts of the country. These areas include Leinster and most of Munster. There are only fewer than thirty-five places to cross the river between the village of Dowra in the north and Limerick in the south. This makes it a strong natural barrier.

Course

The River Shannon is Ireland's longest river. It flows through or between 11 counties. It starts at the Shannon Pot, a small pool in County Cavan, and then flows into Lough Allen. Along its path, it joins many smaller rivers before reaching the Shannon Estuary at Limerick.

The length of the Shannon can vary, but an official Irish source says it is 360.5 km (224 miles). It is the longest river in Ireland and the British Isles. Even though some smaller rivers might seem longer from start to end, the Shannon carries the most water, making it the biggest river in Ireland.

Protected areas

The Shannon Callows are low areas along the river. They are protected as a Special Area of Conservation to keep nature safe for plants and animals.

Settlements

Many towns and villages are along the River Shannon. Some of these places are Kilrush, Tarbert, Glin, Foynes, Askeaton, Shannon Town, Limerick, Castletroy, Castleconnell, O'Briensbridge, Montpelier, Killaloe, Ballina, Portumna, Banagher, Athlone, Lanesborough, Carrick-on-Shannon, Leitrim village, and Dowra.

Historical aspects

The River Shannon has been important for a very long time. It began flowing along its current path after the last big icy time, called the last glacial period, ended.

A writer named Ptolemy wrote about a river called Σηνος (Sēnos) a long time ago in his book Geography.

Later, Vikings came to live in the area in the 10th century. They used the river to travel and reach rich places far inside the land. In the year 937, Vikings from Limerick and Dublin fought at a place called Lough Ree, and the Limerick Vikings lost.

During big fights in Ireland in the 1600s, the river was very important. In the Irish Confederate Wars, Irish fighters used the river as a barrier to protect themselves.

In 1916, leaders of a big event called the Easter Rising thought about using the river as a line to defend, but they did not have the tools needed to try this.

Navigation

1755 to 1820

The River Shannon has always helped people travel in Ireland. It has very little drop in height during its first 250 km, so it can be quite shallow. In 1755, work began to make travel along the river easier. Thomas Omer improved sections between Lough Derg and Lough Ree by building canals and locks. Later, William Ockenden worked on the lower part of the river near Killaloe and Limerick, but progress was slow. It wasn’t until 1799 that the river was finally open for regular use, though it still had many problems.

1820s to Independence

In the 1820s, more people and goods started moving along the river with the help of new steamboat ships. By 1831, thousands of passengers and tons of goods were being carried. However, when a railway opened in 1849, fewer people used the river, and the amount of goods also dropped.

Ardnacrusha and passenger use

In the 1920s, a major power plant was built at Ardnacrusha on the lower Shannon. This changed the river’s use, but in the 1950s, efforts were made to keep the river open for leisure travel. Since then, more and more people have enjoyed using the river for fun and relaxation.

Canals

There are many canals that connect with the River Shannon. The Royal Canal and the Grand Canal link the Shannon to Dublin and the Irish Sea. It is also connected to the River Erne and Lough Erne by the Shannon–Erne Waterway.

Ballinasloe is linked to the Shannon through the River Suck and a canal, and Boyle is connected by the Boyle canal, the river Boyle, and Lough Key. Near Limerick, a short canal lets boats go around the Curraghower Falls, making travel easier. Lecarrow village in County Roscommon connects to Lough Ree using the Lecarrow canal. The Jamestown Canal and the Albert Lock help boats travel between the River Shannon and Lough Nanoge near Drumsna.

Etymology and folklore

Sionnann

In Irish stories, the River Shannon is named after a woman called Sionann. She was part of an ancient group called the Tuatha de Danaan. She wanted to find wisdom and went to a special well. The water burst out, and Sionann was carried away to the sea. After this, she became the goddess of the river.

There is also a story about the famous hero Fionn mac Cumhaill. When he was in danger, Sionann helped him. Fionn threw a powerful stone into the river.

Creatures

People have told stories about a strange creature in the Shannon called Cata. An old book mentions a saint who met this creature. Cata is described as a big animal with a mane like a horse.

Economics

The River Shannon is long but does not rise much above sea level, so it is easy to travel along with just a few locks. There is a place where water power is used to make electricity at Ardnacrusha.

In the 1980s, many improvements were made for ships near where the Shannon meets the sea. Over €2.5 billion was spent building things like a place for big ships at Foynes and an oil supply spot at Shannon Airport. In 1982, a big factory was built at Aughinish to get a special material called alumina from rocks called bauxite. This material is then sent to Canada to make aluminium. In 1985, a large plant that burns coal to make electricity opened at Moneypoint.

Flora and fauna

Shannon eel management programme

There is a special plan to help eels on the River Shannon. Because there are fewer eels now, a trap and transport system was made. This system helps young eels travel safely between Lough Derg and the Shannon estuary.

Fishing

The River Shannon used to be a good place for fishing, especially near Limerick. Fishermen there used special boats called Gandelow to catch Salmon. Another group of fishermen used nets and boats called Breacaun to catch fish until 1929. In that year, a dam was built at Ardnacrusha, which changed the river and made it hard for salmon to live there. Because of this, people stopped fishing for salmon by the 1950s. Today, people still enjoy fishing for fun. Further down the river at Kilrush, some people used boats called Currach to catch herring.

Water extraction

In 2011, Dublin City Council planned to take water from Lough Derg to help supply Dublin city and nearby areas. In 2016, they decided the best place to take the water would be the Parteen Basin south of the lough. The water would be moved to a special tank at Knockanacree near Cloughjordan in County Tipperary and then flow through a pipeline to Dublin.