Which coastal country in Southeast Asia is composed of over 17,000 islands?

Which of the following countries does not have a coastline on the Persian Gulf? Which country has a coastline on the Gulf of Finland? Which country has a coastline on the Black Sea and the Mediterranean Sea? Which country has a coastline on the Adriatic Sea and the Ionian Sea? Which city is home to Tanger Med, one of the busiest container ports in Africa? Which vast bay on Australia's southern coast is lined by the sheer Bunda Cliffs? Which river empties into the ocean at the city of Lisbon? Which coastal country in South America is known for its fjords?