The B5300 runs for several miles along the English side of the Solway Firth.
The road starts end-on on the B5302 at a seemingly random point in West Silloth - where the road turns inland after heading through town - and heads south east for 500 m or so to reach the B5301 junction. Here, we turn sharp right and pass between caravan parks to reach the coast just north of Beckfoot. For a while, we are right near the shore, with good views out across the Solway Firth and across to Scotland, but then we dip inland again, behind the large dune bank of Mawbray Bank at the village of the same name. We're not inland for long however, as the coast is soon rejoined at Dubmill point, where the road turns south and heads for Allonby.
Before that, however, we have to pass Dubmill Scar, where the road is literally on the edge of the beach, with very little protection from stormy weather. It is therefore perhaps unsurprising that warning signs have been set up to alert motorists of the dangers, and that additional signs allow the road to be closed if conditions become too bad.
Allonby is a long village, strung along the roadside with a number of interesting buildings showing that it was once a place of some importance, and not always the sleepy community it now appears. Beyond Allonby, the road remains close to the beach, although never quite so treacherously close as before, passing more caravan sites and plentiful car parks in the dunes. A side road leads inland to Crosscanonby, and then at the further end of the Brown Rigg bank, the road passes a golf course and turns inland, reaching the A596 about a mile later on the edge of Maryport.