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The Sargasso Sea has no coastline

The Sargasso Sea, which lies entirely within the Atlantic Ocean, is the only sea without a land boundary.

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Every other sea is defined at least in part by land. The Sargasso Sea is defined only by ocean currents.

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The deepest point in the ocean is nearly 11 km down

Challenger Deep, in the Mariana Trench, is about 10,935 meters (35,876 feet) deep.

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Two ice sheets hold most of Earth's fresh water

The Antarctic and Greenland ice sheets together contain more than 99 percent of the land ice and over 68 percent of the fresh water on Earth.

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The Pacific holds more than half of Earth's free water

The Pacific Ocean covers about 63 million square miles and contains more than half of the free water on Earth.

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