Prior to the late 13th century, this waterway was a swampy marshland. In 1560, the area was dredged to form a lake now called Castle Lake. It acted as a moat around the three islets that became the foundation for building Frederiksborg Castle. A few years ago, the town of Hillerød created Slotsøen which is a 1.4 mile walking path around the circumference of the citadel. This is an excellent way to appreciate Frederiksborg Slot’s beauty from every angle.
