Nankaidō(南海道?, literally, "southern sea circuit" or "southern sea region") is a Japanese geographical term. It means both an ancient division of the country and the main road running through it. The road connected provincial capitals in this region. It was part of the Gokishichidō system.
Many historic earthquakes bear the name "Nankai" or "Nankaido", as specific epicenters were known at the time. Often quakes take on the Japanese era name along with location such as Nankaido. These include:
Nankai earthquake (南海地震) measuring 8.4 hit at 4:19 [local time] there was a catastrophic earthquake on the southwest of Japan in the Nankai area. It was felt almost everywhere in the central and western parts of the country. The tsunami washed away 1451 houses, caused 1500 deaths in Japan, and was observed on tide gauges in California, Hawaii, and Peru.