Lusen is a 320 million years old granite mountain located in Bavaria, being the highest one in the district Freyung-Grafenau with a peak of 1373 metres. It is the sixth-highest mountain in the Bavarian Forest National Park/Bohemian Forest, behind the Großer Rachel, Kleiner Rachel, Kleiner Arber, Plattenhausenriegel and Großer Arber. It's location is south of the Czech Republic–Germany border.