At the southern end of the Bay is the small tidal island called Worm's Head. At the north is Burry Holms. These islands are accessible at low tide only. Also at low tide, it is possible to see the remains of several shipwrecks, wood from the wreck of the Helvetia being the most prominent when looking north from Rhossili. Worm's Head consists of two islands, Inner and Outer Head. Outer Head reaches 56 metres in height (184 feet), Inner head 47 metres (154 feet).