The Phahonyothin (พหลโยธิน) area of Bangkok is centered around Phahonyothin road, starting from the Victory Monument, a major bus/Skytrain interchange. Also spelled Phaholyothin, Paholyothin etc, it runs parallel to and eventually merges with Vibhavadi Rangsit Road, stretching northward all the way past the old Don Muang Airport (now replaced by Suvarnabhumi) towards Rangsit and Highway 1 to Ayutthaya and (if you keep driving long enough) Chiang Mai.