The Firth of Tay is an estuary located in Scotland, where the River Tay meets the North Sea. It is known for its scenic beauty and is surrounded by several towns, including Dundee and Perth. The estuary is approximately 20 miles long and plays a significant role in the local ecosystem. The Firth of Tay is also notable for the Tay Rail Bridge, which connects Dundee to Newport-on-Tay. This bridge is an important transportation link and has a rich history, having been rebuilt after a tragic collapse in 1879. The estuary supports various wildlife, making it a popular spot for birdwatching.