The main ridge of Jeseník Hrubý is the main European water divide between the Oder - Danube frontier, and thus the two drainage areas of the Baltic and Black Sea. The interface between the basins of the Opava River, a tributary of the Odra and the Morava River, a tributary of the Danube, from the Skřítek at the southern ends of the main ridge continue in a south-easterly direction across the southern surroundings. Rýmařov, Ondřejov and Stranské Ryžoviště form a very flat saddle between Lomnice and Dětřichov and over the top of Bystřicí Slunečné.
