The so-called Church Floor is situated in the meadow just northeast of the hamlet Kirkjubaejarklaustur in the South. The path from the parking area lies past a stone hummock called Hildishaugur, which is better explained under the title Kirkjubaejarklaustur.
The name is can by related to many of the other names in the area that have relation to Christianity like Systrafoss and Systravatn meaning the Nun waterfall and the Nun lake. There was a nun convent in the old days.
The Church Floor is a pure natural phenomenon, the tops of basaltic columns on the surface, covering an area of about 80 m², just like tiles on the ground. Basaltic columns are created when the flowing lava comes to a halt and cools off, probably in boggy areas, where steam percolates through as well. The Church Floor was declared inviolate.