Historically, Drøbak was the winter harbour of Oslo. In severe winters, the fjord freezes from Drøbak up to Oslo.
... United States Census Bureau, the town has a total area of 13.1 km² (5.1 mi²). 11.9 km² (4.6 mi²) of it is land and 1.2 km² (0.4 mi²) of it is ...