what axis controlled country was separated from germany by the north sea?
There was no Axis country across the North Sea.
Denmark is the country located north of Germany.
Denmark
Germany Germany
Denmark.
The Czech Republic is bordered in the North by Poland and Germany
Germany
Denmark.
Germany
There is no country called North Israel, there is just one Israel. If you intended to ask what country is north of Israel, the answer is Lebanon and Syria. The Mediterranean Sea is north of Israel. Greece or Turkey are north, but separated by the sea.
Australia is not a European country so I can exclude that. Germany is north of Switzerland. So the answer is Germany.