Caves in Alaska

Alaska's cave geography is the most remote in the country. El Capitan Cave on Prince of Wales Island in Southeast Alaska is the longest known cave in the state at over 2.5 miles of surveyed passage. The karst terrain of the Tongass National Forest has thousands of additional cave entrances that have never been mapped. Alaska cave country is expedition territory — the infrastructure, weather, and access are all serious. Permits required for most sites.

Every cave listed here is on public or accessible land. Always bring three light sources, water, and let someone know your plans before entering any undeveloped cave. Temperature inside: typically 50–62°F year-round. Explore all caves on the Trek4Free map →