Isle of Portland is a tied island in the county of Dorset, England. It lies in the English Channel, it is 6 km (4 mi) long and 2.7 km (1.7 mi) wide. Portland stands 8 km (5 mi) south of the resort of Weymouth. Portland is a central part of the Jurassic Coast and a World Heritage Site, significant for its geology and landforms. Here can be found Portland Harbour, one of the widest man-made harbours in the world, which was built between 1848 and 1905. Due to its remote coastal location, the island has an extensive range of flora and fauna, being designated as Site of Special Scientific Interest.