Worm's Head is one of the stand out features of the Glamorgan coastline, a long narrow ledge of limestone, projecting into the sea, ending in a 200-foot high wedge shaped crag; the Head takes its name from its resemblance to a dragon. On the northern side of the Worm's Head is the village and Bay of Rhossili, a westerly facing bay that leads backwards to a series of downs, some of the highest land in the Gower. Rhossili Bay ends in the northern formation of Llangenydd Burrows and the islet of Burry Holms. The final stretch of Glamorgan coastline turns north-east to form the Burry Inlet, a shallow and sand-choked estuary which leads to a tract of salt marshes which stretch to the mouth of the River Loughor. The Loughor forming the border between Glamorgan and Carmarthenshire.