The River Soar (/sɔr/) is a major tributary of the River Trent in the English East Midlands and is the principal river of Leicestershire. The source of the river is midway between Hinckley and Lutterworth, it then flows north through Leicester where it is joined by the Grand Union Canal and continues through the Leicestershire Soar Valley, passing Loughborough and Kegworth, until it reaches the Trent at the county boundary. In the 18th century, the Soar was made navigable, initially between Loughborough and the Trent, and then through to Leicester.