The Theodore Roosevelt Conservation Partnership and onX, a Montana-based land data company, analyzed land ownership patterns for a report detailing the extent of state-owned parcels that lack public access.
Montana, Arizona, New Mexico and Wyoming each have more than 1 million acres (0.4 million hectares) of state lands surrounded by private property, according to the report. Nevada has the least amount with less than 1,000 acres (405 hectares) landlocked.