The world's most important 21 miles

When the United States and Israel attacked Iran on Feb. 28, Iran retaliated with attacks that effectively closed the Strait of Hormuz. Oil prices spiked worldwide – and the oversized importance of the strait became crystal clear.

Here is a look at the strait's significance in maps and charts.

What is the Strait of Hormuz?
The Strait of Hormuz is a narrow passage of water between the Persian Gulf and the Gulf of Oman. It is used to transport a number of valuable commodities – most notably, oil...