Karatsu is located in Japan (Karatsu Shi, Saga) and time zone Asia/Tokyo.
Places nearby are Imarichō-kō, Maebaru-chūō and Matsuura.
Fukuoka is 40 km away, Osaka is 464 km away and Nagoya is 587 km away as the crow flies.
Distances from Karatsu to the most important cities in Japan and the world.
33.4425000°
129.9697200°
Algorithm for integer multiplication
https://en.wikipedia.org/wiki/Karatsuba_algorithmCastle in Karatsu, Saga Prefecture, Japan
https://en.wikipedia.org/wiki/Karatsu_Castle