Hallerey, Protected natural area in western Dortmund, Germany
Hallerey is a protected natural area in the west of Dortmund, built around a large lake surrounded by meadows and patches of woodland. The lake sits at the heart of the site, its banks lined with reeds and shoreline plants that give way to open water.
The area was shaped by former coal mining that caused the ground to sink, which allowed the lake to form naturally over time. It was placed under protection in 1977, and a further expansion in 1989 extended the boundaries of the site.
The name Hallerey comes from an old local field name that has been used in the area for centuries. Along the paths around the lake, visitors can spot kingfishers, grey herons, and several duck species, which draws birdwatchers throughout the year.
The site is easy to explore on foot or by bike, with marked paths that circle the lake and pass through the wooded sections. Early morning visits tend to offer the best chances for watching wildlife, and the area stays open throughout the year.
Although the reserve sits deep within an urban area, the lake stays open during most winters because of its depth, which gives wintering waterbirds a refuge when surrounding waters freeze. This makes it one of the more reliable spots in the city for watching waterfowl in the colder months.
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