Upper Sentinel Cave Entrance
Tulelake
long lava tube
Upper Sentinel Cave Entrance is the park's longest beginner-friendly developed lava tube, extending over 3,000 feet in length. The interior is characterized by total darkness, creating an isolated atmosphere that can feel eerie for those exploring alone.
- Carry multiple light sources for the total darkness
- Prepare for a trek exceeding 3,000 feet in length
- Visit with a group to avoid the eerie feeling of isolation
- Wear sturdy shoes suitable for a developed lava tube
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