The Kelvin rises on watershed of Scotland on the moor south east of the village of Banton, east of Kilsyth. At almost 22 miles (35 km) long, it initially flows south to Dullatur Bog where it falls into a man made trench and takes a ninety degree turn flowing west through Strathkelvin and along the northern boundary of the bog parallel with the Forth & Clyde Canal. Its first important (and considerably larger) confluence is with the Chantyclear Burn which originates from the ridge of Dullatur. It then continues its westward flow being joined by the often depleted (due to water being diverted to the canal) Shawend Burn to the west of Craigmarloch bridge. The next important tributary is the Garrel at a point south-east of Kilsyth south of Dumbreck Marsh.