A ground effect vehicle attains level flight close to the surface of the Earth, made possible by a cushion of high-pressure air created by the aerodynamic interaction between the wings and the surface. The 'flying' altitude is limited to one half of its wingspan.

It is a transition between hovercraft and aircraft. The Russian-built "KM" was over 330 ft (100 meters) long, weighed 540 tons fully loaded and could travel over 250 mph (400 km/h). Wiki

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