Today, the Ulmen Maar is 420 metres above sea level, has a surface area of 5.5 hectares and is 36 metres deep. The fact that volcanism is still active is shown by bubbles at the edge of the maar. They bear witness to its roiling past - but don't worry, there is no eruption in sight! An up to 20-metre thick wall of various rocks and ashes surrounds the funnel. For those interested, these witnesses of the explosive past are wonderfully open at St. Matthias Church. This unique wall with its differently coloured layers and round inclusions is not only worth seeing for geologists. The slopes of the Maar basin are overgrown with a beautiful forest, which can be discovered on a circular route. A detour up to the medieval castle ruins, from which crusaders once set out on their battles, is recommended. The view from the crater rim over the Maar and the Eifel behind it takes your breath away. Be it after a sweaty hike or a long car journey - the blue of the Ulmen Eifel Eye glows all too temptingly in summer. But bathing in the Maar is prohibited because it is classified as a nature and water protection area. Instead, you can enjoy the good air while fishing for pike and carp. Perhaps you will even catch a glimpse of the giant fish that is the subject of an old legend. The charming town of Ulmen of the same name lies directly on the Maar. Here guests can stop off at various cafés and restaurants and enjoy a good cup of coffee or a delicious meal. Parking: Visitors are best advised to park at the Old Post Office Square or the Market Square in Ulmen. Both places are centrally located in the town, so it is only a short walk from there to the shore of the Ulmener Maar.