It is nestled on the hillside, deep in the valley, surrounded by black volcanic sand and moss.
The Seljavallalaug pool was built in 1923 as a place where children could learn swimming.
Today, every child is taught it in school as a mandatory requirement.
Image credit:Anna & Michal/Flickr
Seljavallalaug is one of the oldest swimming pool in Iceland.
It was also the largest swimming pool until 1936.
There are no lifeguards, or any kind of facilities near the pool, save for a changing room.
The pool is basically unmanned.
Only once a year, a team of volunteers will scrub the pool and change the water completely.
Despite the utter lack of hygiene, Seljavallalaug is popular among tourists who go in for a quick deep.