Best attractions and places to see around Hammersø include natural features, historical sites, and recreational activities. Hammersø is Bornholm's largest lake and Denmark's only tarn, situated amidst granite hills. The area is known for its dramatic coastlines, ancient ruins like Hammershus, and diverse landscapes. It offers a blend of natural beauty and historical significance for visitors.
Last updated: June 24, 2026
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Large shelter. During our visit, there was even a small tent in the middle of the shelter, and we spent the night there.
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A beautiful place to relax
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Wooden walkway with a platform and tables and benches in Hammersö. A place that invites you to linger.
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Beautiful lake that invites you to linger.
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The ZIP Line was not in operation in May - appears to be installed only during the season.
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Hammersø and Opalsøen former granite quarries https://visitbornholm.com/en/attractions/popular/lakes-and-peat-bogs
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only available seasonally in summer and on certain days
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Crabs live in the lake, the water is very clear. Right next to the lake there is a large covered barbecue and 2 shelters. to a toilet.
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The area around Hammersø is rich in natural beauty. You can visit Hammersø Lake, Bornholm's largest lake, perfect for serene walks and swimming. Adjacent to it is Opalsø, an artificial lake in a former granite quarry, known for its emerald water and the exciting Zipline at Opalsee. The dramatic granite cliffs and unique rock formations of Hammerknuden, Bornholm's northernmost region, offer stunning views and diverse hiking paths.
Absolutely. The most prominent historical site is the magnificent Hammershus Castle Ruins, Northern Europe's largest medieval fortress, offering panoramic views of the Baltic Sea. You can also find the ruins of Salomon's Chapel, a 14th-century chapel, and the ancient Madsebakke Rock Carvings, featuring unique Bronze Age petroglyphs.
Families can enjoy several activities. The Zipline at Opalsee is a thrilling experience for older children (minimum age 6). Swimming in Hammersø Lake is popular in summer, and the Pier with Benches at Hammersø provides a relaxing spot. Exploring the Hammershus Castle Ruins can also be an engaging historical adventure for all ages. Boat trips from Hammerhavnen offer a unique coastal perspective.
The Hammerknuden area is crisscrossed with numerous footpaths, offering diverse scenery from coastal paths to trails around the lakes. You can find various routes, including the 'Hammershus Castle Ruins – Camel Heads Rock Formations loop' or the 'Hammershus Castle Ruins – Hammersø Lake loop'. For more options, explore the Hikes from bus stations around Hammersø guide.
The region offers excellent opportunities for both mountain biking and road cycling. You can find MTB trails like the 'Hammershus Castle Ruins – Allinge loop' or road cycling routes such as the 'Hammershus Castle Ruins – Kirkevej loop'. Discover more routes in the MTB Trails around Hammersø guide and the Road Cycling Routes around Hammersø guide.
Yes, the area is generally dog-friendly. Many hiking trails around Hammerknuden and Hammersø are suitable for walks with dogs. The Pier with Benches at Hammersø is also a dog-friendly spot to relax by the lake.
The summer months (late June to mid-August) are ideal for enjoying swimming in Hammersø and activities like the Zipline at Opalsø. However, the natural beauty of Hammerknuden and the historical sites like Hammershus are accessible and enjoyable throughout much of the year, with spring and autumn offering pleasant hiking weather and fewer crowds.
The nearby twin towns of Allinge-Sandvig offer a vibrant atmosphere with various cafes, restaurants, and accommodation options. These towns are just a short distance from Hammersø and provide convenient bases for exploring the region.
Beyond the panoramic views from Hammershus Castle Ruins, you can find stunning vistas from Hammer Fyr (Hammer Lighthouse) at the highest point of Hammerknuden. The cliffs around Opalsø also offer dramatic viewpoints, and specific rock formations like 'Camel and Lion's Head' on Hammerknuden are notable sights.
Yes, Hammersø is a popular spot for angling, home to various fish species including roach, perch, pike, tench, and eel. Please note that a fishing license is required.
Visitors frequently highlight the serene beauty of Hammersø Lake, describing it as a beautiful little lake and a great photo opportunity, especially with the rocks in the background. The Pier with Benches at Hammersø is also appreciated as a relaxing spot to linger.


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