The highest situated breeding pond in the middle of the Šumava forests.
The Olšina pond near Horní Planá is one of the highest altitude ponds. It is managed by the Military Forests and Farms, and there is a protected monument of a fishing bastion, which introduces fishing, history of the region and hunting. It is also possible to learn about timber rafting on the Schwarzenberg Canal. There is a tradition of fish harvest every two years.