The New Student's Reference Work/Tweed
Tweed, the most famous river in Scotland, rises in Peebleshire, flows for about 20 miles northeast and then in an easterly direction, emptying into the North Sea at Berwick in England. It is 95 miles long, but navigable only a few miles from its mouth. It owes its fame to beautiful scenery and historical associations. Crossing the heart of the Borders between England and Scotland, it has been the scene of many a deadly struggle, and its name is frequent in ballad and story.