Map of BLM's Areas of Critical Environmental Concern
1,120 areas on BLM's map, drawn on USGS topo maps.
Every Area of Critical Environmental Concern on BLM's map, on one map. Hover or tap a line for what BLM found there and what sits inside it. Zoom in on one for its mining claims and rights of way. The list shows the areas in view, the most inside the line first; a row or a line opens the area beside the map, with the door to its page. A view you make here stays in the page's address, so you can send it to someone.
Filter the map
BLM state offices
What BLM found there
Why BLM found it important
What's inside the line
Plan in motion
Size
In view
The 10 areas with the most inside their lines.
- Fremont-KramerCalifornia · 409,826 acresat least1,544inside
- Black Mountains Ecosystem ManagementArizona · 133,225 acresat least1,171inside
- Pinto MountainsCalifornia · 115,540 acresat least1,000inside
- IvanpahCalifornia · 86,428 acresat least746inside
- Green Mountain ACECWyoming · 24,924 acresat least597inside
- South Pass Historical Landscape ACECWyoming · 158,545 acresat least555inside
- Cuerda De LenaArizona · 59,281 acresat least555inside
- Elkhorn MountainsMontana · 53,434 acresat least539inside
- PicachoCalifornia · 197,148 acresat least492inside
- Superior-CroneseCalifornia · 518,461 acresat least485inside
Drawing BLM's 1,120 lines.
Map key
An area on BLM's map, the ground inside its lineMining claimClaimant withheld by BLMFiled and pendingRight of wayYour ZIP
Ground: USGS The National Map. Lines: BLM's map of designated ACECs, read Oct 20, 2026. Zoom in on an area to see the claims and rights of way inside it.