Shell Reef
Ridge in Imperial County, California · on the USGS Shell Reef quadrangle
33.19121, -116.07202
Maps that show Shell Reef
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Shell Reef, CA — USGS 7.5-minute topo (2023)
USGS Topo Maps (public domain) · California
Public domain
Barrel Spring, CA — USGS historical 15-minute topo (1942)
USGS Historical Topo Maps (public domain) · California
Public domain
Barrel Spring, CA — USGS historical 15-minute topo (1947)
USGS Historical Topo Maps (public domain) · California
Public domain
Borrego Mountain, CA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · California
Public domain
Routes of Travel for Western Imperial County — BLM California (2021)
BLM Recreation Maps (public domain) · California
Public domain
Routes of Travel for Eastern San Diego County — BLM California (2021)
BLM Recreation Maps (public domain) · California
Public domain
IFR Enroute Low Altitude Chart L-07 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-04 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-05 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-04 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).