Burned 55,449 acres (224 km², 86.6 mi²) in MT during 2021.
Simplified polygon (≤0.001° tolerance). 7 rings. Centroid 46.536°, -111.273°.
Sourced from the NIFC InterAgency Fire Perimeter History ArcGIS service. Polygon geometry has been simplified to ≤0.001° tolerance for storage; original full-fidelity perimeters are at fire.nifc.gov. We track all 75,044 documented historical perimeters; this detail view renders the top 1,000 by acreage. The shape above is rendered fully server-side with no JavaScript or external mapping library — it preserves the polygon's shape but not its precise geographic placement on a basemap.