Best natural monuments in Osterseen are found within a unique lake district in Upper Bavaria. This region is recognized for its well-preserved ice-cracked landscape, formed about 17,000 years ago during the Würm Ice Age. The Osterseen lake system comprises 19 to 24 individual lakes connected by small channels, offering a diverse natural environment. Visitors can explore geological formations and serene landscapes, making it a notable area for outdoor discovery.
Last updated: July 5, 2026
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If I'm not mistaken, it can be easily circled around and continued as desired to the many small lakes that date back to the Würm Ice Age.
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Wikipedia (Osterseen, 2023-09-06): https://en.wikipedia.org/wiki/Osterseen
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View of the Great Easter Lake 🌊 - East side - Beautiful moorland - Iffeldorf - LKR. Weilheim-Schongau
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The Osterseen are a group of bodies of water south of Lake Starnberg in the Weilheim-Schongau district in Upper Bavaria. The southern and central Osterseen with the Großer Ostersee belong to the municipality of Iffeldorf, the northern Osterseen from the Stechsee and the Frechensee to the municipality of Seeshaupt. Iffeldorf is around five kilometers by road northwest of Penzberg, 20 km southeast of the district town of Weilheim and 50 km south-southwest of Munich city centre. The 20 larger individual lakes have a total area of around 225 hectares and an average depth of a good nine metres. The Kleiner Gröbensee and about 15 unnamed smaller lakes, each with an area of only a few hundred square meters, are not included here, seven of which are already heavily silted up. The Osterseen and the silting-up zone bordering to the west are located in the landscape protection area "Protection of the Osterseen and their surroundings in the communities of Frauenrain, Iffeldorf and Seeshaupt". The area received this protection status as early as 1955. Since 1981 there has also been the Osterseen nature reserve with an area of 1,083 hectares. About a third of this is on the surface of the water bodies, 494 hectares are high, low and intermediate moors, 172 hectares consist of semi-natural mixed forest. Around five percent of the Osterseen landscape consists of riparian regions, silted-up areas and meadows. The nature reserve is divided into three parts, which are separated from each other by the train line of the Kochelseebahn and the state road 2063: Südliche Osterseen, Nordliche Osterseen and Frechensee. In May 1997, the Osterseen were reported to Brussels as a SPA (European bird sanctuary) and FFH area according to the Fauna-Flora-Habitat Directive. In addition to the Eggstätt-Hemhofer lake district and the Seeoner lakes, the area is the largest and most structured icefall landscape in the Bavarian Alpine foothills. The complex of boggy and nutrient-poor lakes, low, transitional and raised bogs alongside bog and swamp forests with its extraordinary diversity of species in the networked habitats, biotopes and ecological niches is of Europe-wide importance for basic scientific research. The beauty of this landscape has always attracted artists. The painter Georg Schrimpf in particular, a main representative of the New Objectivity art movement, created several oil paintings of the Osterseen in the 1930s. Source: https://de.wikipedia.org/wiki/Osterseen
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Bavarian State Office for the Environment (Osterseen Icefall Landscape): https://www.lfu.bayern.de/geologie/bayerns_schoenste_geotope/33/index.htm https://www.lfu.bayern.de/geologie/bayerns_schoenste_geotope/33/doc/33_schautafel.pdf “The Blue Pump The Osterseen are mainly fed by groundwater, which emerges in numerous spring funnels. The best known is the Blaue Gumpe south of the Großer Ostersee. The walls of its spring funnel are covered with white deposits of freshwater lime, which is excreted from the lime-rich spring water. Since the groundwater has a relatively constant temperature of 10°C, the water surface does not freeze in winter. Steam hangs over the spring on cold winter days.” Bank 51 is nearby.
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Bavarian State Office for the Environment (Osterseen Icefall Landscape): https://www.lfu.bayern.de/geologie/bayerns_schoenste_geotope/33/index.htm https://www.lfu.bayern.de/geologie/bayerns_schoenste_geotope/33/doc/33_schautafel.pdf “The Blue Pump The Osterseen are mainly fed by groundwater, which emerges in numerous spring funnels. The best known is the Blaue Gumpe south of the Großer Ostersee. The walls of its spring funnel are covered with white deposits of freshwater lime, which is excreted from the lime-rich spring water. Since the groundwater has a relatively constant temperature of 10°C, the water surface does not freeze in winter. Steam hangs over the spring on cold winter days.” Bank 51 is nearby.
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This of many other springs in the Osterseen is located in the shore area. You can go directly over this groundwater source via a footbridge. Crystal clear water lets you see down to the bottom. Very beautiful!
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The Osterseen region is a unique ice-cracked landscape formed during the last ice age, featuring 19 to 24 individual lakes connected by small channels. You can explore geological formations like deep, funnel-shaped spring pots and enjoy stunning panoramas of shimmering blue waters, idyllic mixed forests, and impressive moorland landscapes. A notable feature is the Blue Gumpe Spring, where calcareous groundwater emerges, creating visible freshwater lime deposits and crystal-clear water.
Yes, many natural monuments in Osterseen are suitable for families. The entire Osterseen lake system offers easy hiking trails and opportunities to enjoy nature. Highlights like the Great Ostersee and the View of the Fohnsee are categorized as family-friendly, providing accessible paths and beautiful scenery for all ages. There's even a small beach at the Great Ostersee for refreshing swims.
The Osterseen region offers beauty throughout the year. In summer, the turquoise-blue lakes provide a 'Caribbean flair' and opportunities for swimming. Spring and autumn are ideal for quieter visits, enjoying relaxation and the changing colors of the landscape. Even in winter, the Blue Gumpe Spring is a unique sight, as its water does not freeze, often creating steam on cold days.
The Osterseen region is a fantastic hiking area with trails suitable for various fitness levels. You can find easy, extensive discovery tours around the lakes, offering wide views and glittering waters. For specific routes, you can explore easy hikes in Osterseen, including loops around the Great Ostersee and Fohnsee, many of which are shaded by forests.
Yes, the Osterseen area offers mountain biking opportunities. You can find various trails, including easy and moderate routes that take you past viewpoints and lakes. For detailed routes, check out the MTB Trails in Osterseen guide, which features routes like the 'View of Großer Ostersee – Steamer Pier loop' and the 'Lakeshore at Osterseen – Swimming spot at Kirchsee loop'.
The Blue Gumpe Spring is special because it's a spring pot where calcareous groundwater emerges from the earth. Its walls are covered with white freshwater lime deposits, and the water is crystal clear. Due to the constant temperature of the groundwater (around 10°C), it doesn't freeze in winter, often producing steam. It's also renowned for its tranquility, making it a fantastic spot for photography, especially in the morning or evening.
Absolutely. The Osterseen region is dotted with viewpoints offering impressive panoramas. A popular spot is the View of the Fohnsee, which provides a quiet and relaxing environment with clear water views. Another notable viewpoint is the View of Marien Island from the leaning tree on the east bank of the Großer Ostersee.
The serene and natural environment of the Osterseen, with its mixed forests and moorland landscapes, supports diverse wildlife. In summer mornings, the area around the Blue Gumpe Spring is filled with the sounds of songbirds. The well-preserved ice-cracked landscape provides habitats for various species, though specific animal sightings will depend on the season and your luck.
The Osterseen lake system is a significant natural monument due to its unique geological origin. It's considered one of Bavaria's best-preserved ice-cracked landscapes, formed about 17,000 years ago during the Würm Ice Age. Melting glaciers left behind deep, funnel-shaped pits that subsequently filled with groundwater, creating the distinctive chain of 19 to 24 interconnected lakes you see today.
Yes, the Osterseen lakes offer opportunities for swimming. The Great Ostersee, the largest of the lakes, has a small beach where visitors can go into the water to refresh themselves or swim. The clear, shimmering blue waters are inviting, especially during warmer months.
The Osterseen natural monument is comprised of 19 to 24 individual lakes. Key lakes within this system include the Großer Ostersee (Great Ostersee), Fohnsee, Sengsee, Eishaussee, Stechsee, and Großer Gartensee. These lakes are interconnected by small channels, forming a unique and extensive lake district.
Hiking trails around the Osterseen natural monuments generally range from easy to moderate. Many routes are suitable for extensive discovery tours and are considered family-friendly. For example, several easy hikes are available, including loops around the Great Ostersee and Fohnsee. Some mountain hikes might be moderate, but the area is largely accessible for various fitness levels.


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