The map of Jossingfjord removes any suggestion that the interception happened in a marginal offshore zone. Modern territorial seas commonly extend twelve nautical miles, while Norway in 1939 used a narrower three-mile limit around a coast broken by islands. Even under that older rule, Altmark was far inside Norwegian territory rather than hovering near its outer boundary. The route resembles driving well up a river inside another state. Geography makes the legal problem plain before Cossack reaches the German ship: the Royal Navy is knowingly conducting an armed pursuit inside a neutral power.
Notable Point · 40:53-42:39
Jossingfjord leaves no territorial-water ambiguity
Use the fjord's geography and changing territorial-sea limits to see how far Britain penetrated neutral Norway.