Liverpool is a city and metropolitan borough in Merseyside, in North West England, along the eastern side of the Mersey Estuary. Inhabitants of Liverpool are referred to as Liverpudlians and nicknamed "Scousers," in reference to the local meal known as 'scouse', a form of stew. In 2004, Liverpool's waterfront was declared as a UNESCO World Heritage site, reflecting the city's importance in the development of the world's trading system and dock technology.