Nankaidō

The is a Japanese term for both an ancient division of the country and the main road running through the region.
History.
"Nankaidō" was one of the main circuits of the Gokishichidō system. It was first established during the Asuka period. Over centuries, the government functions of the "Gokishichido" became less important. However, the traditional eight regions, including "Nankaidō", remained cultural markers.
The "Nankaidō" road connected the capitals of the provinces in this region.
Geography.
"Nankaidō" is the geographic region of Shikoku. Awaji Island was also part of the region.
"Nankaidō" has parts of six ancient provinces and one island, including:
Some geological features, such as the undersea Nankai Trough, have been named for the region.
Nankaidō earthquakes.
Many historic earthquakes have the name ""Nankai" or "Nankaido"". Major earthquakes are named with the Japanese era name and the location such as "Nankaido".