Sunderland is a port city in Tyne and Wear, England. It is a port at the mouth of the River Wear on the North Sea, approximately 10 miles s…Sunderland is a port city in Tyne and Wear, England. It is a port at the mouth of the River Wear on the North Sea, approximately 10 miles south-east of Newcastle upon Tyne. The built-up area has a population of approximately 349,000 as of 2025, making it the second largest settlement in the North East of England after Newcastle. It is the administrative centre of the metropolitan borough of the same name.