 The Dunedin Botanic Garden is the oldest botanical garden in New Zealand, and was established in 1863 on a site surrounding the Water of Leith now occupied by the University of Otago.After extensive flooding in 1868, the gardens were moved to their current site in 1869.The name of the former site is still recorded in corrupted form in the now little-used name of Tanna or Tani (i.e., Botanic) Hill for the small but steep rise located close to the university's registry building).