Tell us what you think of Rainbow Bay by voting in the poll – you can give a 1-to-5-star rating. History and Geography Facts Rainbow Bay, as it is believed to have been unofficially named by its surveyor, Captain Henry John Rous in 1828 while aboard the HMS Rainbow. His survey expedition also included a whale boat trip up the Tweed River and assisting in the recovery of escaped convicts. Officially known as Shark or Sharks Bay up till 1925 when the Point Danger Progress A