Information about Sigöldugljúfur / Valley of tears

Sigöldugljúfur used to be a river way, but when the hydro electric damn Sigölduvirkjun was built, the water from the waterfall Sigöldufoss was directed into the damn, forming the "Valley of tears" where countless waterfalls meet and fall together down the cliffs and into the river below.

Once every 5 years the damn closing the canyon is opened up for maintenance and then Sigöldufoss is visible again, for only a week.