The Foss á Siðu waterfall will make your journey along the Ring Road on the southern coast more pleasant. Due to its relatively low flow and considerable height, it is one of those waterfalls that, during very windy weather (which is not uncommon in Iceland), seems to ‘fall upwards’.
You can find the Foss á Siðu waterfall on the southern coast of Iceland, about halfway between the town of Vík í Mýrdal and the Glacier Lagoon.