Reliance, Jamnagar (India)

On a single site in Gujarat, Reliance refines nearly 1.24 million barrels per day, more than the capacity of entire countries. The complex turns cheap heavy crudes into fuels and petrochemicals exported worldwide, making it a discreet but central link in the global supply of diesel and gasoline. Its dependence on imported crude, transiting through Hormuz to the nearby terminal, exposes it to any Gulf supply disruption.