Liquid hydrocarbon deposits often extend across national frontiers in such a manner that an entire deposit may be exploited, wholly or in part, from either side of the boundary line. This "characteristic of liquid hydrocarbons has been a fundamental cause of disputes, conflicts, and even wars in many parts of the world.
Reynolds, Thomas A.
"Delimitation, Exploitation, And Allocation Of Transboundary Oil & Gas Deposits Between Nation-States,"
ILSA Journal of International & Comparative Law: Vol. 1
, Article 7.
Available at: http://nsuworks.nova.edu/ilsajournal/vol1/iss1/7