Archaic term for a side road or shortcut. In modern Japanese, 脇道 or 近道 are more common. Cross-referenced with 間道 (かんどう), a similar archaic word.
See also: 間道 (かんどう)
On the old map, a side road leading to the village is marked.
Compound of 側 (そば, 'side') and 道 (みち, 'road'). The exact historical derivation is uncertain, but the word is now archaic.