Lakes around Alflen are primarily found in the surrounding Eifel region, known for its unique volcanic lakes called maars. Alflen, a municipality in Rhineland-Palatinate, Germany, serves as a base for exploring these geological formations. The area offers natural landscapes characterized by these crater lakes, providing opportunities for hiking and observing geological features. The proximity to the town of Ulmen places visitors near significant natural attractions.
Last updated: June 24, 2026
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The Ulmen Maar lies 420 meters above sea level today, covers an area of 5.5 hectares, and is 36 meters deep. The bubbles at the maar's edge demonstrate that volcanism is still active. They bear witness to a turbulent past—but rest assured, there's no eruption in sight! A wall of various rocks and ash, up to 20 meters thick, surrounds the cone. For those interested, these testimonies to this explosive past are beautifully displayed in St. Matthias Church. This unique wall, with its different colored layers and rounded inclusions, is worth seeing for more than just geologists. The slopes of the maar basin are covered with a beautiful forest, which can be explored on a circular walk. A detour to the medieval castle ruins, from which the Crusaders once launched their campaigns, is recommended. The view from the crater rim over the maar and the Eifel beyond will take your breath away. Whether after a sweaty hike or a long drive, the blue of the Ulmer Eifel lake is all too tempting in summer. However, bathing in the maar is prohibited because it is designated as a nature and water protection area.
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The lower castle has completely disappeared. You can still see the beginning of the ring that connected the lower castle and the Ulmen city wall, a two-story outer wall of the palace, as well as a cistern and some foundation walls of other buildings. The old part of Ulmen Castle was built around 1074 AD and likely rests on the remains of a Roman settlement. In the Middle Ages, Ulmen Castle was further expanded and divided into the upper castle, whose remains of the walls still exist, and the lower castle, which extended to the banks of the maar river. Two knightly families lived in the castle, which is believed to have never been attacked or destroyed until 1673 due to its size. Only the Sun King's troops succeeded. It was rebuilt, but fell again in 1689 during the War of the Succession. However, Ulmen Castle was also rebuilt this time, with only the city wall being abandoned. With the invasion of Napoleon's soldiers, Ulmen also became French and later Prussian. The empty castle, whose last descendant died in 1801, was auctioned to a merchant from Cochem, who sold it as a quarry. When a devastating fire burned Ulmen to the ground in the 19th century, the residents of Ulmen rebuilt their houses with stones from the castle. That's why you can still see a coat of arms on some of the stables today. It wasn't until the early twentieth century that Ulmen Castle was declared a listed building and became the property of the municipality of Ulmen. The castle is always freely accessible.
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The Immerather Maar is 6 hectares in size, lies at an altitude of 371 metres in the Volcanic Eifel and is 1.50 metres deep.
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The Ulmener Maar is small but beautiful. Located in the middle of the Eifel and in the middle of the city, it is a wonderful destination. You can easily combine a walk around the maar with a walk around the neighboring Jungferweiher. Both have recently been connected by the Ulmener Maar tunnel, which runs under the A 48 motorway.
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The Jungferweiher Maar is located at an altitude of 428 meters, is 1.7 hectares in size and is very shallow and swampy at 80 cm.
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Sleepy Maar, but full of life. Worth staying and watching for a while.
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A visit is worthwhile both in summer and in winter. However, the Ulmener Maar is a nature reserve, which is why bathing is strictly forbidden here!
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The Pulvermaar in the Vulkaneifel southeast of Daun is a water-filled maar whose almost circular lake is, despite its small area of around 38.48 hectares, one of the deepest in Germany at 72 meters. Like the smaller Holzmaar, it is part of the Gillenfelder Maaren. Beautiful hiking trails and nature.
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The lakes around Alflen are primarily volcanic crater lakes, known as maars, located in the Eifel region. These unique geological formations, like the Ulmener Maar, are recognized for their volcanic origins and geological significance, with the Ulmener Maar being an IUGS Geological Heritage Site and the youngest maar in the Eifel.
Yes, several lakes are great for families. Pulvermaar offers an easy 2.5-kilometer circular route and swimming opportunities in summer. The Maiden Pond (Jungferweiher) provides a quiet, accessible circular walk, and the Ulmener Maar area combines nature with historical castle ruins, which can be interesting for children.
Near the Ulmener Maar, you can explore the ruins of Ulmen Castle, an 11th-century knight's castle situated on the southern edge of the maar's embankment. This adds a historical dimension to the natural scenery.
The area around Alflen and its maars is excellent for various outdoor activities. You can enjoy hiking on trails like the 'HeimatSpur Wacholder-Endert Pfad' or the 'Jungfer Pond – Maiden Pond loop'. There are also road cycling routes, such as the 'View of Jungferweiher – Bergkrone Mine Tunnel loop', and MTB trails, including the 'Ulmener Maar Tunnel – Maiden Pond loop'. For more details on routes, visit the Hiking around Alflen, Road Cycling Routes around Alflen, and MTB Trails around Alflen guides.
Yes, Pulvermaar offers great swimming opportunities at its bathing station during the summer months. Please note that swimming is prohibited in the Ulmener Maar due to its status as a nature and water protection area.
The Eifel maars can be enjoyed year-round. Spring and autumn offer pleasant temperatures for hiking and vibrant natural colors. Summer is ideal for activities like swimming at Pulvermaar, while winter provides a serene, quiet atmosphere, though some facilities might have reduced hours.
Yes, the circular route around the Maiden Pond (Jungferweiher) is noted as being wheelchair accessible, offering a pleasant and quiet walk for all visitors.
While many trails in the Eifel region are dog-friendly, it's always best to check specific regulations for each lake or nature reserve. Generally, dogs are welcome on leashes on hiking trails around the maars, but access to bird sanctuaries (like parts of Jungferweiher) or bathing areas might be restricted.
The lakes offer diverse natural features. The Ulmener Maar features a well-preserved tuff wall, showcasing layers of volcanic rock and ash. The Maiden Pond is a silted-up maar with an attached bird sanctuary, making it excellent for birdwatching. The Immerath Maar is a smaller, scenic nature reserve surrounded by flower meadows.
Yes, the charming town of Ulmen, located directly on the Ulmener Maar, offers cafes and restaurants. You can find various accommodation options, including guesthouses and Ferienwohnungen (holiday apartments), in Ulmen and the surrounding villages.
The Pulvermaar is the deepest maar in the Eifel, reaching a depth of almost 80 meters.
The Immerath Maar is known for being less crowded than some of the more popular maars, partly because there isn't a car park in its immediate vicinity, encouraging visitors to explore on foot. It offers a calm and untouched natural setting.


Still not found your perfect lake around Alflen? Check out the guides of these regions to see even more beautiful places.