|Location Map ( geo)|
|From:||St Margarets Hope (ND448930)|
|Distance:||1.9 miles (3.1 km)|
|Route outline (key)|
The C21 starts on the A961 just south of St Margarets Hope and heads south east across fields scattered with occasional roadside houses. After reaching a summit, it drops, crossing the C20 at a crossroads, and then descends more steeply to the car park for the church at Kirkhouse, sitting picturesquely above the shore, where it ends.