Boubín Mountains - 28 km

You can find a description of the route at: http://ondra-pdvyv.wz.cz/odkazy/XVII-S.htm
Other routes can also be found at http://ondra-pdvyv.wz.cz
You can find interesting information about the route in Guidebook III: http://ondra-pdvyv.wz.cz/PkP/PkP3.pdf (p. 41), or with annotations at https://www.turistika.cz/cestopisy/ guide-to-guide-iii-remote-routes.