Devonport is a port city situated at the mouth of the Mersey River on the north-west coast of Tasmania, Australia. Positioned 47 kilometres ea…Devonport is a port city situated at the mouth of the Mersey River on the north-west coast of Tasmania, Australia. Positioned 47 kilometres east of Burnie and 98 kilometres north of Launceston, its harbour manages over half of Tasmania's imports and exports, standing as the busiest freight port on the island. Devonport also plays a central role in Tasmania's trade sector, supporting industries such as agriculture, manufacturing, and tourism. The City of Devonport's gross domestic product was estimated at $3.5b in 2023.