The country of Montenegro has a coastline on which sea?

The Adriatic is part of the Mediterranean! Both are right

luckycatfay, there are some other seas part of Mediterranean sea, such as Ionian sea, Egean sea etc beside the Adriatic sea. The question was very specific, so that the right answer is the Adriatic sea.

Bit unfair really as the Adriatic sea is part of the Mediterranean Sea.