Stretching across Oahu's eastern coast, these mountains began their birth as volcanoes that faced periods of extensive erosion. The crest averages 2,600 ft. in elevation, with the highest peak standing at 3,150 ft. For dramatic views of the Koolau Mountains, visitors can take either the H3 or Pali Highways, which cross right through these extinct volcanoes.
This cinder cone remnant of the last active volcano is the tallest tuff ring in Hawaii, measuring 1,207 ft. in height. The steep slopes drop into the Molokai Channel while the inside of the crater is home to a botanical garden filled with native dryland flora and fauna. Hiking trails are available to the top of Koko Crater, as well as inside.
The Waianae Mountains are a volcanic range along the SW side of Oahu. The highest point on the mountains is Kaala, which peaks at over 4,040 ft. These mountains cover 225 sq mi. of area. A great view of the mountains can be seen from Puaena Point.