Question: Where are most of the us oil refineries located?
Disambiguated questions and answers: question: Where with respect to geographical features are most of the us oil refineries located?
On what coast are most of the us oil refineries located?
In what states are most of the us oil refineries located?
answer: near navigable waterways, especially seaports or Great Lakes ports
along the Gulf Coast
Texas, Louisiana, and California
Natural Questions answer: along the Gulf Coast (from the Wikipedia article "Petroleum refining in the United States")