Regent's Park is one of the Royal Parks of London. It lies within north-west London, partly in the City of Westminster and partly in the London Borough of Camden. The park is Grade I listed on the Register of Historic Parks and Gardens. The south, east and most of the west side of the park are lined with elegant white stucco terraces of houses designed by John Nash. The park is mainly open parkland that enjoys a wide range of facilities and amenities including gardens, a lake with a heronry, waterfowl and a boating area, sports pitches, and children's playgrounds. The northern side of the park is the home of London Zoo. There are several public gardens with flowers and specimen plants, including Queen Mary's Gardens in which the Open Air Theatre is located, the formal Italian Gardens and adjacent informal English Gardens. On the northern side of Regent's Park is Primrose Hill, which has a clear view of central London to the south-east, as well as Belsize Park and Hampstead to the north. The park lies within the City of Westminster and the London Borough of Camden.