Goðafoss waterfall is located on the river Skjálfandafljót in north Iceland, the fourth largest river in Iceland. Although the main waterfall is the most visited and photogenic I actually found the lower falls more interesting. Just downriver from the main falls, the river narrows and is forced into a slot between volcanic rock formations. The small drop is slightly stair-stepped and creates several channels as the glacial blue water shoots through the slot. The sound is deafening and the sheer power of water hydraulics is on display.