Figure 2. Map of the Long Beach area showing the areas of the Wilmington oil field where Tidelands Oil Production Company (western portion) and THUMS Long Beach Company (Long Beach Unit) are the field contractors. The city of Long Beach, Department of Oil Properties, operates both portions. The limits of the Wilmington field, along with those of the Long Beach field and the Seal Beach field, are shown. The coastline, harbor areas, breakwater, and oil-drilling islands are shown for reference. Pacific Energy Resources operates the polygonal area between the properties. The western notch is the Wilmington Townlot Unit (WTU), which is operated by Magness Petroleum Company. Exxon operates the southeast area (not delineated) as State Lease 186 Belmont Offshore. This portion is under abandonment.