Hammersø – Northern Bornholm

Nestled between the granite cliffs of Hammerknuden and the sea, Hammersø is Denmark’s northernmost and highest natural lake, a place of quiet reflection surrounded by dramatic scenery. The lake lies just inland from the rugged coastline near Sandvig and Hammerhavn, formed in a deep, glacial basin carved into the island’s granite bedrock. Its dark, mirror-like surface perfectly reflects the surrounding cliffs and heather slopes, creating one of the most serene and photogenic landscapes on Bornholm.

The atmosphere here shifts with the light. On calm mornings, the water is still as glass, reflecting the sky and cliffs in flawless symmetry. In the evening, golden light filters over the ridge of Hammerknuden, turning the granite warm and soft. When mist rolls down from the high ground, the lake becomes mysterious and almost alpine in mood. Despite its proximity to some of Bornholm’s most visited sights — Hammershus, Opalsøen, and Hammerhavn — Hammersø feels remarkably peaceful, a natural pause in the drama of the island’s north.

A narrow path circles the lake, winding through birch, pine, and heather. From the trail, you can look up to the granite ridges above or catch glimpses of the Baltic beyond. For photographers, it’s a place of contrasts: still water and rugged cliffs, reflection and solidity, intimacy and vastness. In many ways, Hammersø captures the essence of Bornholm itself — compact yet full of depth, shaped by both fire and ice, and illuminated by an ever-changing northern light.

Best time to visit

• Early morning for calm reflections and mist.
• Sunset for golden tones on the cliffs.
• Autumn for deep color contrasts and atmospheric light.

Practical tips

• Parking near Hammerhavn or Opalsøen; short walk to the lake.
• The circular path around the lake is easy and well-marked (1.5 km).
• Best light in low sun or overcast weather for reflections.
• Combine with Hammershus Slotsruin, Opalsøen, and Hammerodde Fyr for a full northern Bornholm circuit.