The River Cam flows through the city from the village of Grantchester , to the southwest. It is bordered by water meadows within the city such as Sheep's Green as well as residential development.  Like most cities, modern-day Cambridge has many suburbs and areas of high-density housing. The city centre of Cambridge is mostly commercial, historic buildings, and large green areas such as Jesus Green, Parker's Piece and Midsummer Common . Many of the roads in the centre are pedestrianised. Population growth has seen new housing developments in the 21st century, with estates such as the CB1  and Accordia schemes near the station,  and developments such as Great Kneighton, formally known as Clay Farm,  and Trumpington Meadows  currently under construction in the south of the city. Other major developments currently being constructed in the city are Darwin Green (formerly NIAB ), and University-led developments at West Cambridge and North West Cambridge , ( Eddington ).