the gnadensee lies between allensbach in the north and the island of reichenau in the south. in the west it extends to the mettnau peninsula (radolfzell) and its eastern end borders on the wollmatinger ried nature reserve and the reichenaudamm with its prominent avenue of poplars. the extremely small part in the northwest is called the markelfinger winkel. together with the latter it has an area of 13 square kilometres. it reaches a maximum depth of 19 metres.