Ape Cave, Lava tube system in Mount St. Helens National Volcanic Monument, Washington, US.
The Ape Cave extends over two miles underground, featuring smooth walls formed by ancient lava flows and temperature remains constant at 42 degrees Fahrenheit.
The lava tube system formed approximately 2000 years ago when molten rock flowed down Mount St. Helens, creating hollow passages as the lava drained away.
Local loggers discovered the cave in 1950, and a group of explorers called the Mount St. Helens Apes conducted initial investigations of the underground passages.
Visitors need reservations between May and October, sturdy footwear, multiple light sources, and warm clothing to explore the upper and lower cave sections.
The cave floor contains rock formations, including lava benches and flow marks, while the surrounding forest displays evidence of volcanic activity through the ages.
Location: Washington
GPS coordinates: 46.10810,-122.21200
Latest update: March 6, 2025 22:42
Washington State presents natural waterfalls, old forests, and historic lighthouses. The state contains hiking trails through lava caves, military forts, and Native American cultural sites. The region features coastal landscapes, alpine lakes, and volcanic formations.
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