The River Severn is very long. 

The River Severn is very long. 

The River Severn is the longest river in Great Britain. 


The River Severn is a very important part of the landscape in Great Britain. It is the longest river in the entire country. 
As the river travels, many other smaller rivers join it. These smaller rivers are called tributaries. Some of the biggest ones are the Vyrnwy, the Teme, and the Warwickshire Avon. The river moves through many towns and cities along its path. You can find the town of Shrewsbury in Shropshire along its course. 
People have been connected to this river for a very long time. The name of the river has many different versions in history. Long ago, the Romans called the river Sabrina. 
The river has shaped the land over millions of years. Much of the landscape was formed during the last ice age. Scientists have different ideas about how the river moved through the rocks. Some think a huge lake called Lake Lapworth once sat in Shropshire. This lake might have overflowed and cut through the land to make the Ironbridge Gorge. Other scientists think the river flowed through a deep trench under the ice. This history of ice and rock created the valleys we see today. 
Today, the River Severn is still a place of wonder and movement. One amazing thing that happens is called the Severn bore. This is a large wave that moves up the river. 

The River Severn is the longest river in Great Britain. It also holds the record for the most voluminous flow of water in England and Wales. 
The river begins high in the Cambrian Mountains of mid Wales. It rises on the Plynlimon massif at an altitude of 610 metres. This area sits near the border of Ceredigion and Powys. From this high point, the water flows through several English counties. These include Shropshire, Worcestershire, and Gloucestershire. The river passes through important county towns like Shrewsbury, Worcester, and Gloucester.
Many smaller rivers, known as tributaries, join the Severn along its journey. These tributaries add more water to the main flow. The three largest non-tidal tributaries are the Vyrnwy, the Teme, and the Warwickshire Avon. The Vyrnwy begins at Lake Vyrnwy and flows east through Powys. It gathers water from the Banwy, Cain, and Tanat rivers. Other notable rivers like the Wye and the Bristol Avon join the river later. These join the Severn once it reaches the wide estuary section. 
The geography of the Severn is shaped by complex geology and ancient ice. The river's current form is partly due to glaciation during the Pleistocene epoch. In Wales, the river flows through Ordovician and Silurian rocks. As it moves into the Shropshire Plain, it crosses Permian and Triassic strata. Some parts of the river run across Carboniferous rocks, such as near Shrewsbury. There are two main theories about how the river formed its path. One theory suggests a large lake called Lake Lapworth once sat in Shropshire. This lake may have overflowed and cut the Ironbridge Gorge. An alternative theory suggests the river flowed through a bedrock hollow called the Severn Trench. This trench might have been cut by successive ice ages.
The history of the river's name shows many different cultural influences. The Romans called the river Sabrina during their occupation. In mythology, Sabrina was a nymph who drowned in the water. 
The river ends at the Severn Estuary. This is the wide area after the Prince of Wales Bridge. The estuary sits between Severn Beach in Gloucestershire and Sudbrook in Monmouthshire. The total drainage basin for the estuary is 55,700 square kilometres. This figure does not include the areas of the River Wye or the Bristol Avon. The estuary discharges its water into the Bristol Channel. This channel opens into the Celtic Sea and the Atlantic Ocean.
There are unique natural events and sights along the Severn. One famous event is the Severn bore. This is a large wave that travels up the river. 
🖼️ Images & Media (9)
More to explore
✨ What else?
Related topics you might enjoy
What is Nepedia?
A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.