|Distance:||1.6 miles (2.6 km)|
|Route outline (key)|
The C1131 forms a loop through Portskerra to the north of Melvich. It starts at the west end of Melvich on the A836 and heads north to a fork. Both onward arms are the C1131, with the two roads curving round in a lengthy oval to meet each other and return to this junction.