1.   The company sued Alabama for drilling rights since the state sold it the land but refused to grant an offshore permit.

2.   The islands are valuable to Greece, giving it more access to the continental shelf - and hence, oil drilling rights -- than Turkey.

3.   Lissouba has accused France of giving monetary and military support to Sassou-Nguesso in a bid to win lucrative oil drilling rights for several French companies.

4.   Shell is the third defendant in lawsuits brought by the state over natural gas drilling rights in state waters.

5.   Other problems between Turkey and Greece include the Cyprus question and oil drilling rights in the Aegean Sea.