The trail is not marked, but well to discern except in winter time. After about 1 km up the hill slope, one is coming in the area of Heiðin há, because here, the trail lies over Katlahraun lava field, one of the lava flows produced by the shield volcano. This lava reaches into the valley Hlíðardalur and from there up on Hvalskarð. Some moorland is here to be found where in former times the people from Selvogur took the turf for fire making and the construction of their Icelandic turf houses.