Champagne Pool, Waiotapu
The pool fills a 900-year-old crater which is about 60 metres across by 60 metres deep. The waters are tinted green with arsenic, sulphur and iron compounds. It's bubbling with carbon dioxide at about 74 degrees C and depositing orange antimony along with traces of gold, silver and mercury on its rim and the huge sinter terraces that drain it. It's my favourite thermal attraction in Rotorua.
Photo credit: Rob Suisted
Rotorua