A Japanese sword is one of several types of traditionally made swords from Japan.
Swords have been made from Kofun period and generally Japanese swords are the ones after the Heian period having curves, and there are many types of Japanese swords that differ by size, shape, field of application and method of manufacture.
The longest nihonto is this Odachi called “Norimitsu Odachi”, is 377 cm long and weighs 14.5 kilograms.
(Ōdachi (大太刀?, “big big sword”)/Nodachi (野太刀?, “big field sword”): Very large tachi, some in excess of 100 cm, and usually a blade of the late 14th century.)
What was the size of the samurai who used this sword for battle?
Think how amazing it would have been if it was wielded by a huge 8ft samurai. Legend around a nearby town is that if you slay the giant, you get to keep his sword as proof.
Take a look at the giant in the end of this video.