Where is the world's largest fusion experiment located?

The International Thermonuclear Experimental Reactor, known as ITER, is under construction in Cadarache, in southern France. ITER is an international project involving dozens of countries and is designed to test whether fusion can become a practical large-scale energy source. The tokamak is intended to produce far more energy than the plasma it heats, though it is not expected to generate electricity directly. ITER has been under construction for years and represents one of the most ambitious engineering projects in modern physics.