The Lakes (Danish: Søerne) in Copenhagen, Denmark are a row of three rectangular lakes curving around the western margin of the City Centre, forming one of the oldest and most distinctive features of the city’s topography. The paths around them are popular with strollers, bikers and runners.
In the early Middle Ages, a need of water for watermills was determined. As a result of this a dam was built and the Peblinge Sø was created.
As a result of a siege of Copenhagen in 1523, it was decided to expand the entrenchments in order to improve the fortifications of the city. The levee at Peblinge Sø was expanded and another was created, which resulted in the creation of Sortedams Sø. In the beginning of the 16th century, Sankt Jørgens Sø was created, by further damming. This made it possible to flood the banks and lakes in case of an attack.
There are plans to create a park around Sankt Jørgens Sø, with the dual use of acting as a detention basin for cloudburst flood waters. Likely as a consequence of Global Warming, cloudbusts have become much more common in Denmark, making the sewerage pipes designed for the old weather patterns insufficient; using Sankt Jørgens Sø as a detention basin is just one of many such projects in Copenhagen.  The municipality of Copenhagen together with Nordic Innovation, an organisation under Nordic Council of Ministers, is launching an extensive climate adaptation and urban space initiative with objectives such as redirecting rainwater from cloudbursts, purifying the water running into the Peblinge City Lake, and creating new, attractive and more liveable urban spaces.
Since we are all on lockdown, but are allowed walks, Danes flock to parks and beaches in spite of the biting cold, but the views are all worth it!