Waimea Canyon (Kauai, Hawaii, United States)
Also known as the "Garden Isle," Kauaʻi ([kɐˈwɐʔi] in Hawaiian) is the oldest and fourth largest of the main Hawaiian Islands. Legend has it that Hawaiʻiloa, the Polynesian navigator who discovered the Hawaiian Islands, named it after his favorite son.
According to Kauai.com, "Like the other islands, Kauai was initially inhabited roughly 1500 years ago by the same Polynesian adventurers who completed their nearly 2000 mile sea voyage on outrigger canoes when they first landed on the shores of the big island of Hawaii. Here they stayed undisturbed for around 500 years, until a second wave of sea-canoe travelers appeared, this time from Tahiti (which was also originally settled by Polynesian sea-canoe explorers). It was from the Tahitian arrival that the current Hawaiian gods, belief structures and many traditions evolved."
Waimea (meaning "reddish water" in Hawaiian) Canyon, or the Grand Canyon of the Pacific, is 16 kilometres long and 900 metres deep. A number of geological events have chiseled it over a period of 5 million years. One of them is erosion with the Waimea River and extreme rainfall on Mount Waiʻaleʻale, one of the wettest places on earth.
The peak receives an average of 11,500 mm of water every year!