Qagnax Cave
A lava tube where have been found remnants of unique dwarf mammoths (Mammuthus primigenius) who lived here around 3700 BC. Cave – 12 m deep pit – was discovered in 1999. Only in Wrangel Island mammoths lived more recently (2590 BC), as far as it is known.
El Capitan Pit
Deepest vertical shaft in the mainland USA, 182.4 m deep. It is near El Capitan Cave but the connection has not been found yet. Discovered in 1989.
El Capitan Cave
The longest cave in Alaska – 3,846 m long and up to 130.8 m deep.
Valley of Ten Thousand Smokes
Valley that is filled with volcanic ash from an eruption in 1912. The layer of ashes is up to 210 m deep. After the eruption there formed thousands of fumaroles from this ashfield, most are extinct by now. Rivers have formed deep canyons in this ashfield.
Indecision Creek
A stream with waterfalls that flows down from Mount Chiginagak volcano. Stream is very acidic, with pH of 1.2, its water has a sulfuric odor.
Baranof Warm Springs
Group of nine warm springs with temperature up to 49 °C. Next to the springs is powerful waterfall – outlet of Baranof Lake.
Mount Shishaldin
The most symmetrical cone-shaped and glacier-clad mountain in the world. This 2857 m high volcano is continuously active and emits a plume of steam.
Mount Martin
Volcano with a very active fumarolic activity. The crater contains an intermittent acidic lake and thick sulfur deposits.
Mount Douglas crater lake
Approximately 160 m wide, highly acidic crater lake with pH of its water reaching 1.1.
Mount Cleveland
Near symmetrical stratovolcano, 1 730 m high. Almost constantly active. Nearby from the sea rise several more symmetrical volcanic cones – such as the beautiful cone of Mount Carlisle and Herbert Island.