Nationalpark Vorpommersche Boddenlandschaft
Ummanz is around 20 square kilometres in area and thus, after Rügen, the second largest island in the former county of Rügen. It is part of the Western Pomerania Lagoon Area National Park. The island is bounded to the west and northwest by the Schaproder Bodden, to the north, by the inlet of Udarser Wiek, to the east by the lake of "Koselower See" and the "Breite" and to the south by the Kubitzer Bodden. The island of Ummanz is very flat; its highest point lying just 3 metres above sea level (NN).