The Strait of Hormuz, a waterway that runs alongside Iran and through which roughly 20 percent of the world's oil supply runs through has been blocked.

About 20-30 percent of global oil and gas supplies are shipped through the Strait of Hormuz.

The Strait of Hormuz, a waterway that runs alongside Iran and through which roughly 20 percent of the world's oil supply runs through has been blocked.

The Strait of Hormuz is the narrowest point in the Persian Gulf and a vital link for oil shipments. See where it is and what could happen next.

Following US-Israeli strikes on Iran, maritime traffic in the Persian Gulf has ground to a halt. These disruptions risk causing congestion at Asian ports.