Adams Island is part of Auckland Islands archipelago. The southern end of Auckland Island broadens to a width of 26 km (16 mi) where a narrow channel, known as Carnley Harbour or the Adams Straits, separates it from the roughly triangular Adams Island (area approximately 100 km² or 39 sq mi), which is even more mountainous, reaching a height of 705 m (2,313 ft) at Mount Dick.