Axlarfoss is located in South Iceland in the highlands north east of Mýrdalsjökull glacier not too far from the Syðri Fjallabak route. It is situated in the river Hólmsá and drops about 8 meters. The Syðri Fjallabak route is from the village of Hvolsvöllur to the east, passing north of Þórsmörk and then north of Mýrdalsjökul and arriving then at ring road 1 east of the village of Vik in south Iceland. Axlarfoss is just about a 1 km road off the Syðri Fjallabak route ending in a parking lot by the waterfall.
GPS 63.806244, -18.762588