The Lower Lake Constance is loosely divided into three sections around the Island of Reichenau: The two German parts, the Gnadensee (lit.: "Lake Mercy") north of the island and north of the peninsula of Mettnau (the Markelfinger Winkel), and the Zeller See, south of Radolfzell and to the northwest of the Reichenau island, and the mainly Swiss Rheinsee (lit.: "Rhine Lake") – not to be mismatched with the "Seerhein" at its start! – to the south of the island and with its southwestern arm leading to its effluent in Stein am Rhein.