The Barrier is a lava dam retaining the Garibaldi Lake system in southwestern British Columbia, Canada.

[2] The Barrier was formed about 15,000–12,000 years ago when large lava flows emanated from Clinker Peak on the west shoulder of Mount Price.

[3][4][5] The unstable lava formation of The Barrier has in the past unleashed several debris flows in the area below Garibaldi Lake.

[7] Concerns about The Barrier's instability due to volcanic, tectonic, or heavy rainfall activity prompted the provincial government to declare the area immediately below it unsafe for human habitation in 1981.

[8] This led to the evacuation of the small resort village of Garibaldi nearby, and the relocation of residents to new recreational subdivisions away from the hazard zone.