The Myōkō-class cruisers (妙高型巡洋艦, Myōkō-gata jun'yōkan) were a series of four heavy cruisers built for the Imperial Japanese Navy in the late 1920s. Three were lost during World War II. The ships of this class displaced 11,633 tons (standard), were 201 metres (659 ft) long, and were capable of steaming at 36 knots (67 km/h; 41 mph). Their main armament were ten 20 cm/50 3rd Year Type naval guns in five twin turrets which were complemented by a heavy torpedo armament; at the time, this was the heaviest armament of any cruiser class in the world. They were also the first cruisers the Japanese Navy constructed that exceeded the (10,000 ton) limit set by the Washington Naval Treaty.