Oil platforms in the Long Beach area.  The four small islands shown in Long Beach Harbor are artificial islands for oil and gas wells.
US Bureau of Ocean Energy Management
2013-08-10 09:30:09
<a rel="nofollow" class="external free" href="http://www.boem.gov/uploadedFiles/BOEM/Oil_and_Gas_Energy_Program/Leasing/Regional_Leasing/Pacific_Region/Leasing/long-beach-san-pedro-map.pdf">http://www.boem.gov/uploadedFiles/BOEM/Oil_and_Gas_Energy_Program/Leasing/Regional_Leasing/Pacific_Region/Leasing/long-beach-san-pedro-map.pdf</a>