"Imperial Sand Dunes Recreation Area" by Bureau of Land Management California , public domain

Imperial County

Travel Map North Central

Map of Routes of Travel for North Central Imperial County in El Centro Field Office area. Published by the Bureau of Land Management (BLM).

Map of Routes of Travel for North Central Imperial County in El Centro Field Office area. Published by the Bureau of Land Management (BLM).

source

Bureau of Land Management (BLM), November 2016

also available

National Parks
USFS NW