The Boos Double Maar consists of two silted-up maars, which today appear as shallow depressions in the terrain. They are located within the municipality of Boos. The two maars formed between 10,150 and 14,160 years ago and belong to the Quaternary volcanic field of the Volcanic Eifel.
The two maars form large, circular basins surrounded by tuff embankments. They lie on a west-southwest-east-northeast trend, thus following the Variscan strike of the subsurface. The west-southwest maar has a diameter of approximately 700 m and a depth of between 30 and 60 m; the east-northeast maar is between 650 and 700 m and a depth of between 50 and 87 m. Both depressions are very humid, so there are still areas that have a permanent water surface. The waters were formerly used as fish ponds, but later silted up and served as meadows and fields. Today, there is once again a fish pond in the west-southwestern part of the maar, the Booser Weiher. In the vicinity of the maars, there are tuff pits where the volcanic tuff formed during the eruption of the maars was mined.
Very beautiful nature.