Quick -- what's the top oil-producing country in the world? Off the top of your head. Here's a hint: if you're picturing a desert nation in the Middle East, you're close, but wrong. Somewhere in South America? Gigantic Brazil, or notoriously oil-rich Venezuela? Not quite. Seriously, though, it's good to know this stuff; it's important to know where the largest oil-holding and exporting countries are around the world -- to modern oil-dependent economies, few things are more important than who controls the oil. Huffington Post has a slideshow revealing the top 20 oil producing nations around the world. For those who can't bear the suspense, here's the answer -- spoiler alert -- it's Russia.