Firth of Clyde is the broad, irregularly shaped mouth of the River Clyde in southwestern Scotland. The firth is a large bay 50 miles (80 kilometers) long and more than 30 miles (48 kilometers) wide in places. The North Channel connects it with the Atlantic Ocean and with the Irish Sea. Several islands dot the firth, including Ailsa Craig and Arran. Shipping from Glasgow, which lies inland on the River Clyde, has an outlet through the firth.
The Firth of Clyde is the largest estuary (coastal river mouth) in western Scotland. It has a wide range of wildlife and habitats. The nearby seas support basking sharks, dolphins, porpoises, seals, and whales.
See also Ailsa Craig ; Arran .
