Frederiksberg is a part of the Capital Region of Denmark. It is formally an independent municipality, Frederiksberg Municipality, but is typically treated as a part of Copenhagen. and had a population of 103,192 in 2015. Frederiksberg is an enclave surrounded by Copenhagen Municipality and there is no clear border between the two. Some sources ambiguously refer to Frederiksberg as a quarter or neighbourhood of Copenhagen. However, Frederiksberg has its own mayor and municipal council, and is fiercely independent. Frederiksberg is considered to be an affluent, or "posh", area. and is characterised by its many green spaces, such as the Frederiksberg Gardens and Søndermarken. Some institutions and locations that are widely considered to be part of Copenhagen are actually located in Frederiksberg. For example, Copenhagen Zoo as well as several stations of the Copenhagen Metro are located in Frederiksberg. The Copenhagen S-train system also has several stations in Frederiksberg, including Peter Bangs Vej station and Flintholm station.