An Alberta First Nation is suing the province over development approvals that the band says threaten sacred land the government has promised to protect.
The Fort McKay First Nation filed the lawsuit in an Edmonton court late last week.
It says Alberta has approved or is about to approve developments that encroach on Moose Lake.
The First Nation says that area is one of the last remaining in its traditional territory where it can pursue traditional practices.
The government released a draft plan in February that would offer the area some protection.
But over the summer, the provincial energy regulator OK'd an oilsands project that would come within two kilometres of the lake.
No one from the government was immediately available for comment.