Matavulu Blue Hole, Espiritu Santo Island / Vanuatu (by Chris&Steve).

Waterhole at Simpson’s Gap in Western MacDonnell Ranges, Australia (by Georgie Sharp).

Blue clear waters of Waihou River, New Zealand (by planmyplay).

Fern Hammock Springs in North-Central Florida, USA (by BurningQuestion).

Fern Hammock Springs in Florida, USA (by fbrogers).

Stone path in Hell Valley, Beitou Hot Springs, Taiwan (by Dai Rui).

Berry Springs near Darwin, Northern Territory, Australia (by katehatehotmail).

photo by PicArt by Mike on Flickr.

Hamurana Spring is the deepest natural fresh water spring on the North Island of New Zealand.