The area includes the CBS municipalities of Hoge Mors, Lage Mors and Transvaalbuurt. Together with Stevenshof and Leeuwenhoek / Pesthuiswijk (including Leiden Biological Science Park and LUMC Base) it forms the West district. The area is bordered by the Oude Rijn river in the south, southwest and east, which is also called Galgewater locally. The area is further surrounded by the A44 motorway in the west and Plesmanlaan in the north.