Colossal Cave

Large cave system with a total length of explored passages at 5.6 km.

Thunder Spring

Powerful spring that starts as a 30 m tall waterfall in the rim of the side canyon of Grand Canyon.

Mooney Falls

Approximately 58 m tall waterfall in Havasu canyon. Around the falls are interesting tufa formations, below the falls have formed terraces.

Havasu Falls

A gorgeous, some 30 m tall waterfall in the narrow canyon of Havasu Creek. The water has an unusual blue color that contrasts with the red color of the cliffs. Below the falls are travertine terraces.

Deer Creek Falls

In this location Deer Creek emerges from its slot canyon and falls directly into Grand Canyon. It forms 46 m tall waterfall.

Cheyava Falls

The tallest waterfall in Arizona. It starts as a spring from the cave in the wall of the side canyon of Grand Canyon. The total height is approximately 244 m, the tallest drop is approximately 122 m tall. For the most part of the year, it is almost dry.

Beaver Falls in Havasu Canyon

Group of tufa terraces in the deep Havasu Canyon. A beautiful contrast of light blue water and red cliffs.

The largest Fremont cottonwood in Skull Valley

This is the largest currently known Fremont cottonwood (Populus fremontii). The tree has a circumference of 14.22 m and height of 31 m (2017). It was planted in 1917.

Montezuma Well

Large sinkhole, 112 m wide and 17 m deep. It is fed by powerful springs and its water has a high level of dissolved arsenic. In the sinkhole live at least five endemic organisms.

Saguaro National Park, West

One of the best locations to see the unique saguaro cactus (Carnegia gigantea) stands with thousands of these giant cacti. One of the most biologically diverse deserts in the world.