Artlish Caves Provincial Park, Cave network in Strathcona Regional District, Canada

Artlish Caves Provincial Park covers 285 hectares along the Artlish River in the Haihte Range, with the 1,521 m Mook Peak at its eastern edge. Its two main caves, Artlish River Cave (396 m) and Black Hole Cave (740 m), lie in the northwest; the river runs through Artlish River Cave, Canada's largest known active river cave by volume and dimensions.

The area was officially documented in 1932 by the Canadian Geological Survey, though hunters and timber workers had known about it long before. Protection as a park came later after local knowledge led to formal study.

The name comes from the A'licath people of the Kyuquot confederacy, who held ties to this territory across many generations. These caves were part of the landscape they inhabited and knew well.

To reach the caves, visitors must walk across forest roads and trails for several kilometers before crossing the park boundary. Sturdy footwear and weather-appropriate clothing are important since the route goes through active forest areas.

The Artlish River flows completely underground through one of the main caves, creating Vancouver Island's last undisturbed karst river system. This hidden waterway forms a rare landscape feature that has become scarce across the island.