Large oil reserves…
The Province has two types of sources for petroleum extraction at the Atlantic ocean coast, located in the city of Muanda: 
off-shore (n the open ocean) &
on-shore (on land).
Several oil wells are located in a string on the mainland and off the Congolese coast.

Several oil wells are located in a string on the mainland and off the Congolese coast.
However, the level of oil production has remained at around 27,000 to 28,000 barrels per day (bpd) in total for many years.