suru verb (irregular), intransitive verb
go north; proceed northward
Obsolete intransitive suru verb. In modern Japanese, this meaning is normally expressed with phrases like 北へ行く or 北上する.
古い地図には「此の道を北すれば都に至る」と記されていた。
An old map read, 'If you go north along this road, you will reach the capital.'
Modern standard verb for 'go north' or 'advance northward'. 北する is its obsolete predecessor.
Compound of 北 (north) + する (to do). The exact historical derivation is uncertain; it is an obsolete formation that has been replaced by 北上する in modern Japanese.