Blue space is a sub-set of green space and is officially described as ‘outdoor environments; either natural or manmade; that prominently feature water and are accessible to people’.
Is-set o fannau gwyrdd yw mannau glas a chânt eu disgrifio'n swyddogol fel amgylcheddau awyr agored; naill ai rhai naturiol neu artiffisial; sy'n cynnwys dŵr fel elfen amlwg ac sy'n hygyrch i bobl’.