Oh the beauties of Polish nature. 70 km down Modra and Brda. Modra definitely for fans of extreme sports.
While the Brda River is fairly unobstructed, Modra, apart from the fallen trees as a result of the surrounding cataclysm, will certainly surprise you with a calamus trap on the backwaters.
In the organization helped:
http://www.agrokajaki.pl/
See also the film from the whole adventure:
https://wise.technology/2019/08/22/splyw-kajakowy-brda-i-modra-2019-film/