* Indian Ocean: Marco Polo was the first European to describe the Indian Ocean in detail. He sailed across the Indian Ocean several times, visiting India, China, and other countries in the region.
* South China Sea: Marco Polo was the first European to provide a detailed description of the South China Sea. He sailed across the South China Sea on his way to China.
* Strait of Malacca: Marco Polo was the first European to describe the Strait of Malacca, which connects the Indian Ocean and the South China Sea. He sailed through the Strait of Malacca on his way to China.
* Persian Gulf: Marco Polo was the first European to provide a detailed description of the Persian Gulf. He sailed across the Persian Gulf on his way to India.
* Arabian Sea: Marco Polo was the first European to describe the Arabian Sea in detail. He sailed across the Arabian Sea on his way to India.