Wodnik
Wodnik is the Polish male water spirit, ruler of lakes, rivers, ponds, and millponds. Documented by Oskar Kolberg in Pomeranian and Masovian materials. Controls aquatic creatures; drowns those who disrespect his waters. Fishermen offer tobacco for good catches. Appears as a green-clad man or naked figure. West Slavic counterpart to Czech Vodník and Russian Vodyanoy.