Strohner Maarchen, Dry volcanic crater in Vulkaneifel, Germany.

Strohner Maarchen is a dry volcanic crater in the Vulkaneifel region near the village of Strohn. It forms an elongated oval basin that visitors can explore through walking paths that lead around and into the crater depression.

The crater formed through volcanic activity in the Vulkaneifel region, which shaped the geological character of the area. After the eruptions ceased, the crater floor gradually accumulated organic matter and became the foundation for the current landscape.

The name Strohner Märchen uses the diminutive of "Maar" because the basin, 210 by 140 metres, is small for a maar. The site lies in the nature reserve "Pulvermaar mit Römerberg und Strohner Märchen", together with the Pulvermaar and the Römerberg hill, whose slopes hold impact craters of volcanic bombs thrown from the Strohner vent.

The crater lies within the nature reserve "Pulvermaar mit Römerberg und Strohner Märchen", whose paths connect it with the Pulvermaar to the north and the Römerberg hill. The crater rim is almost completely eroded and barely visible, so the depression is easy to miss from the open ground. The basin is covered by a growing raised bog and is close to final silting up, so stay on the trails rather than walking onto the peat.

The peat in the basin is nearly 10 metres thick and still growing, so the crater is close to being completely silted up. Pollen analysis of the moor dates its formation to about 8800 BC, giving the latest possible date for the tuff of the maar eruption beneath it.