Labels:text | screenshot | font OCR: Some Major rivers in Britain The longest river in Britain is the Severn which flows into the Bristol Channel on the west coast. However, compared to rivers around the world, British rivers are mere streams! The Thames, for instance is just over 200 miles long, while the Amazon in south America is around 4000 miles long. The longest river in the world is the Nile in north east Africa which is about 150 miles longer than the Amazon . Tamar Avon