Across the lake from Hallormsstaður is the river Hengifossá which spills into the lake Lögurinn.
Two big waterfalls are in the river, Hengifoss (118 m) and Litlanesfoss. Hengifoss is the third highest waterfall of Iceland and therefore a very interesting place to visit. It is certainly worth walking up to it.
It is framed with very beautiful and remarkably long and regular basaltic pillars. You can also walk or climb behind the waterfall where a small cave is to be found.
