Fez (morroco's capital province) is probably the best province for oil since it starts with ~300K pops and is connected to shore so getting it early on with some healthcare reforms & medicine research to get the population as high as possible you can pump out enough oil for an entire navy with just 1 tile (this is the facts in GFM, and i dont know if other mods have this since GFM makes some insane RGO tiles in other places)