Newtown River is a large natural inland harbour located on the Isle of Wight's northwestern coast, named after the nearby village of Newtown. It is sometimes also referred to as Newtown Creek. Newtown Harbour is the name given by Natural England to the River and surrounding land, and this area is the only national nature reserve on the island. It is owned an…Newtown River is a large natural inland harbour located on the Isle of Wight's northwestern coast, named after the nearby village of Newtown. It is sometimes also referred to as Newtown Creek. Newtown Harbour is the name given by Natural England to the River and surrounding land, and this area is the only national nature reserve on the island. It is owned and managed by the National Trust.