|Length:||18.7 miles (30.1 km)|
|Met (1923):||A388, B3216, A39|
|Now part of:||B3254|
|Route outline (key)|
The B3259 was a long rural B-road along the Devon/Cornwall border.
Despite its length the road went through few villages; Yeolmbridge and Whitstone were two of the larger ones. The only classified road it met en route was the B3216 at Red Post, to the east of Bude. A couple of miles north of here the road bore left and ended shortly afterwards on the A39 in Kilkhampton.