The B4593 is a short route on the Swansea side of the Gower Peninsula. Between about 1935 and 1970 the route was an extension of the A4067. Before that, it had been unclassified.
The road starts at an end-to-end junction with an unclassified road at Caswell Bay and heads east into the urban area. After following a somewhat twisty course between the leafy and well-heeled residential districts of Newton and Langland the road ends at a mini-roundabout junction with the A4067 and B4433 (both of which also end here) close to the seafront in the centre of Oystermouth, near the southern end of Swansea Bay.