This was taken at Álafoss, a few hundred yards from the modern Istex mill where Lopi Yarn is produced.
In the early days of the industry, in the late 19th century, this river ran with naturally warm water. The raw wools were washed in it.
Today, the original mill building houses a shop that sells Lopi–including the famous unspun yarns that are put up in little wheels.
Footnote: Across the path from the shop is a former swimming pool that became the recording studio for the band Sigur Rós.
Before this trip I wasn't a fan of either Lopi or Sigur Rós. Boy, did that change in a hurry.