discharges Lake Hengifossarvatn on the
Fljotsdalsheidi moorland and spills into Lake Logurinn. Two main
waterfalls decorate this river, the third highest of the country,
Hengifoss (118m) and Litlanesfoss, framed with beautiful, long and
regular basaltic pillars.
The basaltic strata surrounding The
Hengifoss are interesting because of the thin, red layers of clay
between the basaltic lavas. Fossilized trunks of coniferous trees,
sensitive to cold, and lignite, which depict warmer climates during
the latter part of Tertiary. It is possible to walk or rather climb
behind it to inspect a small cave. The walk up to the waterfalls is
relatively easy and well worth the effort.