The Nervión Estuary is a tidal estuary located in northern Spain, primarily flowing through the city of Bilbao. It is formed by the confluence of the Nervión River and the Cantabrian Sea, playing a crucial role in the region's ecology and economy. The estuary is characterized by its diverse habitats, including mudflats and marshes, which support various wildlife species. Historically, the Nervión Estuary has been vital for trade and industry, contributing to the development of the surrounding urban areas. Today, it serves as a recreational area, with walking paths and parks along its banks, enhancing the quality of life for residents and visitors alike.