Weymouth is a seaside town in Dorset, England, situated on a sheltered bay at the mouth of the River Wey on the English Channel coast. The town is 13 kilometres (8 mi) south of Dorchester and 8 kilometres (5 mi) north of the Isle of Portland. The town's population is 52,950 (2006). The A354 road bridge connects Weymouth to Portland, which together form the borough of Weymouth and Portland. The history of the borough stretches back to the 12th century; including involvement in the spread of the Black Death, the settlement of the Americas, the development of Georgian architecture, and preparations for World War II.