 The A498 descends from a 277 m (909 ft.) summit at Pen-y-Gwryd and runs south west through the village of Beddgelert and the Aberglaslyn Pass, where it overlaps the A4085.The A498 then passes through Tremadog, overlapping the A487 for a short length before passing under the Cambrian Coast railway and terminating at Penamser on the A497 about a mile west of Porthmadog.At its northern end, the road forms a link via the A4086 with the A5 at Capel Curig, forming a useful holiday route to the Beddgelert/Porthmadog area.