What is the name of the bay that borders the city of Rio de Janeiro?

Which country has the coastline along the Black Sea? Which country has the longest coastline in the world? Which country has a coastline on the Adriatic Sea? Which country is home to the world's longest sandy beach? Which of the following countries does not have a coastline on the Baltic Sea? Which country has a coastline on the Caspian Sea? Which of the following countries has a coastline on the Black Sea? Which of the following countries does not have a coastline on the Persian Gulf?