Lakes around Retterath are primarily characterized by the volcanic crater lakes, known as maars, of the Vulkaneifel region. This area features unique geological formations, including the youngest volcanic maar in Germany. The landscape offers a blend of natural beauty, geological intrigue, and recreational opportunities. Visitors can explore diverse natural landmarks and historical sites within a short distance of Retterath.
Last updated: June 27, 2026
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Very beautiful artificial lake created, for big and small, what
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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 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.
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beautiful small reservoir, ideal for a short walk
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The history of the Volcanic Eifel can be explored at the Booser Doppelmaar. The Booser Doppelmaar consists of two silted-up maars, which today appear as flat hollows in the terrain. The two maars were formed between 10,150 and 14,160 years ago. Viewed from above, the two maars are circular basins. The west-southwest maar has a diameter of around 700 m and is between 30 and 60 m deep, the east-northeast maar is between 650 and 700 m large and has a depth of 50 to 87 m. The two hollows are very wet, so there are still places that have a permanent water surface. The water areas were previously used as fish ponds, but later silted up and served as meadows and fields. Today there is again a fish pond in the west-southwestern maar, the Booser Weiher, see also https://de.wikipedia.org/wiki/Booser_Doppelmaar
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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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The lakes around Retterath are primarily volcanic crater lakes, known as maars, located in the Vulkaneifel region. This area is characterized by unique geological formations, including the Ulmener Maar, which is considered the youngest volcanic maar in Germany, formed about 10,900 years ago.
The Schalkenmehrener Maar is a popular destination where swimming and boating are permitted, making it ideal for families and relaxation. In contrast, swimming is prohibited in the Ulmener Maar and Jungfer Pond due to their status as nature and water protection areas.
Yes, the Ulmener Maar features the ruins of a medieval castle atop its southern edge, adding a historical dimension to the natural scenery. This castle is known as the Upper Castle of Ulmen.
The region offers various outdoor activities. You can enjoy hiking on trails like the 'Klein Amerika Rest Area – Muße-Platz Uersfeld loop' or cycling routes such as the 'Ulmener Maar Tunnel – Ulmener Maar loop'. For more options, explore the hiking and cycling guides around Retterath.
Absolutely. The Heilbachsee is an artificially created lake with a circular path and attractions suitable for families. The Jungfer Pond is also considered family-friendly, offering a pleasant circular walk. The Schalkenmehrener Maar is popular for families due to permitted swimming and boating.
The Jungfer Pond is a renowned bird sanctuary, protected for its rare flora and fauna. It's an excellent spot for nature observation, especially during migration periods in spring and autumn, with a bird observatory on its western bank.
The Ulmener Maar Tunnel is a recently opened pedestrian tunnel that connects the Ulmener Maar with the nearby Jungfer Pond. It offers an accessible route and provides insights into geological formations and historical water management.
The Maiden Pond (Jungferweiher) is noted as wheelchair accessible, offering a pleasant and quiet circular route. Many trails around the maars are well-maintained, but specific accessibility details vary by location.
The village of Schalkenmehren, located directly at the Schalkenmehrener Maar, offers restaurants and cafés for refreshments. Other villages surrounding the maars also provide options for dining and accommodation.
Visitors appreciate the blend of natural beauty, geological intrigue, and recreational opportunities. The komoot community has shared over 700 photos and given more than 900 upvotes, highlighting the scenic views, unique volcanic landscapes, and diverse activities like hiking, cycling, and relaxing by the water.
Fishing is permitted in some lakes. For example, you can fish for pike and carp in the Ulmener Maar, and the Jungfer Pond is also known for its abundance of fish. Fishing permits are typically issued by local municipal administrations.
The lakes are beautiful year-round. Spring and autumn are ideal for hiking and nature observation, especially for birdwatching at Jungfer Pond during migration periods. Summer is perfect for swimming and boating at Schalkenmehrener Maar, while winter offers unique scenery and even ice skating opportunities on the Jungfer Pond when conditions allow.


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