The Irwell Valley is a geographical area located in northwest England, primarily along the River Irwell. This valley stretches through the counties of Lancashire and Greater Manchester, serving as a natural boundary between the two regions. The river itself flows from Mersey to Bury, providing a vital waterway for the surrounding communities. Historically, the Irwell Valley played a significant role in the Industrial Revolution, with many mills and factories established along its banks. Today, it features a mix of urban and rural landscapes, including parks and nature reserves, making it a popular destination for outdoor activities and local wildlife observation.