Randecker Maar, Volcanic crater in Swabian Jura, Germany
The Randecker Maar is a volcanic crater roughly 1.2 kilometers across that forms a natural depression in the landscape. This nature reserve spans about 110 hectares and is drained by the Zipfelbach stream running through the bottom.
This volcanic formation emerged about 17 million years ago during the Miocene epoch, and once held a lake within its crater. Sediments in the crater preserved fossils of plants and animals from that distant time.
This site is known among birdwatchers because thousands of birds stop here to rest and drink during their migrations. Observation stations along the trails show how important this location has become for studying migratory birds.
The site is accessible year-round with marked trails for walking and observation throughout the reserve. Binoculars and bird guides are helpful for exploring the bird diversity during migration seasons in spring and autumn.
Erosion on the northeastern wall created a natural pass that funnels birds and insects during their migration routes. This made the location valuable for long-term scientific observations and research.
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