Derby is a city and unitary authority area in the East Midlands region of England. It lies upon the banks of the River Derwent and is located in the south of the county of Derbyshire, of which it is traditionally the county town. Today, Derby is an internationally renowned centre for advanced transport manufacturing, home to the world’s second largest aero-engine manufacturer, Rolls-Royce. Shopping in central Derby is divided into three main areas. These are the Cathedral Quarter, the St Peters Quarter and the Intu Derby shopping centre. The Cathedral Quarter was Derby's first BID (Business Improvement District), and includes a large range of shops, boutiques, coffee shops and restaurants. Intu Derby is the city's main indoor shopping centre.