The Firth of Tay is a substantial tidal estuary and the largest river drainage basin in the United Kingdom by measured discharge, covering approximately 2,000 square miles. This wide, 25-mile-long sound is formed by the confluence of the River Tay and River Earn below the city of Perth, ultimately draining into the North Sea. The estuary is characterized by its immense catchment area, which ensures a powerful flow and creates a diverse marine environment with miles of rugged coastline. The Firth is flanked by the city of Dundee on its north bank and the towns of Newport-on-Tay and Newburgh along its shores. The area is designated as a Special Area of Conservation (SAC), a Special Protection Area (SPA), and a Ramsar site, highlighting its international ecological importance, particularly for its Atlantic Salmon population and coastal habitats.