High Quality Content by WIKIPEDIA articles! The Forth and Clyde Canal is a canal opened in 1790, crossing central Scotland; it provided a route for the seagoing vessels of the day between the Firth of Forth and the Firth of Clyde at the narrowest part of the Scottish Lowlands. It is 35 miles (56 km) long and it runs from the River Forth near Grangemouth to the River Clyde at Bowling, and had an important basin at Port Dundas in Glasgow.