The Mersey is a river in northwest England, flowing through the city of Liverpool and into the Irish Sea. It is approximately 70 miles long and is known for its tidal nature, which affects its flow and navigation. The river has played a significant role in the region's history, particularly during the industrial revolution, when it facilitated trade and transportation. The Mersey is also famous for its iconic landmarks, including the Mersey Ferry, which offers scenic views of the waterfront. The river is home to various wildlife and is an important ecological area, contributing to the biodiversity of the region.