Drøbak in Norway is the centre of the municipality of Frogn, in Akershus county. The town is located along the Oslofjord, and has around 12,000 inhabitants. The municipality Frogn in the county of Akershus, Norway, has 13,153 inhabitants as of January 1, 2004. ... Akershus is a county in Norway, bordering Hedmark, Oppland, Buskerud, Oslo and Østfold. ...

Traditionally, Drøbak was the winter harbour of Norway's capital, Oslo, since in severe winters the fjord will freeze from outside Drøbak all the way up to Oslo. County Oslo NO-03 Landscape Viken Municipality NO-0301 Administrative centre Oslo Mayor (2004) Per Ditlev-Simonsen (H) Official language form Neutral Area  - Total  - Land  - Percentage Ranked 224 454 km² 426 km² 0. ...

A notable event in Drøbak's history is the WWII sinking of the German cruiser Blücher in the Drøbak narrows, on the early morning of 9 April 1940. The cruiser was transporting German soldiers and bureaucrats for the planned swift occupation of Oslo, but the sinking by the Oscarsborg fortress delayed this, and thus allowed for the evacuation of the Norwegian royal family, parliament, and cabinet, and for the nation's gold reserves to be denied the occupants. Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ... The German heavy cruiser Blücher ¹ was the German Kriegsmarines newest ship at the outbreak of World War II. The Blücher is most notable for being sunk on April 9, 1940, less than three years after her launch, on the first day of the invasion of Norway (Operation Weserübung). ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... 1940 was a leap year starting on Monday (link will take you to calendar). ...