The northern arm of Iguazu river finishes in a 'canyon' known as the devil's throat, where a continous mist of water produces an almost constant rainbow.
Some of the cascades plummet straight down for 269 feet into the gorge below. Others are interrupted by ledges and send up clouds of mist and spray, creating a dazzling display of rainbows.
Strung out along the rim of a crescent-shaped cliff about 2.5 miles long is a series of some 275 individual cascades and water falls separated by rocky, densely wooded islets.
This is one of the most impressive parts of the falls, The devils throat or Garganta del diablo (in espanol) is a location where a lot of the river meets and the results are spectacular.