What is Blue space?
[[File:The_Water-Lily_Pond_-_Google_Arts_&_Culture.jpg|thumb|The Water-Lily Pond - Google Arts & Culture]] [[File:Downtown_Green_Bay_CityDeck_along_the_Fox_River.jpg|thumb|Downtown Green Bay City Deck along the Fox River, Wisconsin]] [[File:Chattanooga_waterfront_-_panoramio.jpg|thumb|Chattanooga waterfront - panorama]] [[File:View_of_Brooklyn_Bridge_Park_from_Manhattan_Bridge.jpg|thumb|View of Brooklyn Bridge Park from Manhattan Bridge]] [[File:Christmas2004inMedellín.JPG|thumb|Christmas2004inMedellín, Colombia]] [[File:Playa_de_la_Caleta_en_Cádiz_-_panoramio.jpg|thumb|Playa de la Caleta en Cádiz - panoramio]] [[File:Longfellowbridge_Boston.jpg|thumb|Longfellow bridge Boston]] In [[urban planning]] and [[Urban design|design]], '''blue space''' or '''blue infrastructure''' refers to all the areas which have [[Body of water|bodies of water]] or water courses (that is [[Lake|lakes]], [[River|rivers]], and [[bays]]). Together with greenspace (parks, gardens and the like), it allows to lower the temperature in the city (called [[urban heat island]]).<ref>{{Cite journal|last1=Gunawardena|first1=K.R.|last2=Wells|first2=M.J.|last3=Kershaw|first3=T.|date=15 April 2017|title=Utilising green and bluespace to mitigate urban heat island intensity|journal=Science of the Total Environment|language=en|volume=584-585|pages=1040–1055|bibcode=2017ScTEn.584.1040G|doi=10.1016/j.scitotenv.2017.01.158|issn=0048-9697|pmid=28161043|doi-access=free}}</ref> Many cities have waterbodies. Very often, these waterbodies have been important in the history of the city. One such example is the [[River Thames]] in London.<ref>{{Cite journal|last1=Gunawardena|first1=K.R.|last2=Wells|first2=M.J.|last3=Kershaw|first3=T.|year=2017|title=Utilising green and bluespace to mitigate urban heat island intensity|journal=Science of the Total Environment|publisher=Elsevier BV|volume=584-585|pages=1040–1055|bibcode=2017ScTEn.584.1040G|doi=10.1016/j.scitotenv.2017.01.158|issn=0048-9697|pmid=28161043|doi-access=free}}</ref> Accessible blue spaces can help revi