This is the famous "Kyffhäuser" road in the Harz mountains in central Germany, right near the old East / West border. It's one of the best motorcycling roads in an area that's full of great motorcycling roads. Video is from 2019 on my Kawasaki Z1000SX. Sorry about the poor quality - the crappy Garmin editor that I used seems to reduce the image quality when I crop the clips.