 NY 23A begins southeast of the hamlet of Prattsville at a three-way junction with NY 23 in the town of Prattsville.NY 23 enters the intersection from the northwest and turns left (east) to continue toward Windham while traffic proceeding straight through the junction is directed on NY 23A.It heads generally southward along the eastern banks of Schoharie Creek, continuing the course set by its parent route through northwestern Greene County.