Question: Where are most of the us oil refineries located?
qaPairs: question: Where with respect to geographical features are most of the us oil refineries located?
answer: near navigable waterways, especially seaports or Great Lakes ports
question: On what coast are most of the us oil refineries located?
answer: along the Gulf Coast
question: In what states are most of the us oil refineries located?
answer: Texas, Louisiana, and California