source: Wikipedia: List of oil refineries
Oil refineries are the backbone of the world economy, most of our energy generated is from fossil fuels and refineries play an essential role. Currently there are about 660 of them
In the chart above I have shown the 10 largest refineries. The largest is in India called the Jamnagar Refinery. It has the capacity of refining 1,240,000 barrels of crude oil per day.