The Oasis Hiroba 21 (OASISひろば21) is a skyscraper located in Ōita, Ōita Prefecture, Japan. Construction of the 102-metre, 21-storey skyscraper was finished in 1998.

Oasis Hiroba 21
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33°14′17″N 131°36′06″E / 33.23806°N 131.60167°E / 33.23806; 131.60167