What is the world's saltiest body of water?

Which sea is connected to the Mediterranean Sea through the Bosphorus and the Dardanelles? What is the name of the sea that borders the countries of Sweden and Finland? Which sea is located between the Italian Peninsula and the Balkan Peninsula? What is the world's deepest ocean? Which ocean has the highest tides? What is the world's largest sea by surface area? Which strait connects the Atlantic Ocean to the Mediterranean Sea? What is the name of the sea that separates the islands of Great Britain and Ireland?