What is the name of the passage that connects the Black Sea to the Sea of Marmara, known for meaning "cow crossing"?

The passage that connects the Black Sea to the Sea of Marmara is called the Bosphorus. The term "Bosphorus" is derived from Greek, meaning "cow crossing," which relates to the mythological tale of Io, who was transformed into a cow and crossed this strait. The Bosphorus is a significant waterway both geographically and historically, serving as a boundary between Europe and Asia and playing a crucial role in maritime trade routes throughout history. Its strategic importance has made it a focal point of commerce and cultural exchange in the region.

The other passages mentioned, while also significant in their own rights, serve different geographical functions or connect different bodies of water. The Dardanelles connects the Aegean Sea to the Sea of Marmara but does not directly link to the Black Sea. The Strait of Gibraltar connects the Atlantic Ocean to the Mediterranean Sea, and the Aegean Passage does not refer to a commonly recognized waterway. Therefore, the Bosphorus is the correct name for the passage described in the question.