A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
... of 5.8 km² (2.2 mi²). 5.4 km² (2.1 mi²) of it is land and 0.3 km² (0.1 mi²) of it is water. The total area is 5.83% water. Demographics ...