I suppose your question is which of these countries have a coastline?
Andorra - no
Austria - no
Germany - yes
Greece - yes
Portugal - yes
Sweden - yes
Switzerland - no
The Netherlands - yes
The area of the Balkan countries is frequently plagued by ethnic conflict that generates tension among the nations. This tension has given away to several small conflicts and the trend continued. The location of the Balkans is strategically very important. I hope the answer helps you.