Mystery Image of the Day

Monday-Friday we'll be posting an image here with clues - can you guess what the subject of the photo is? Answers on the next day!
Images are free and in the public domain, but please credit NASA.

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Named indirectly for the Arabic "Jabal Ṭāriq" (Tariq's Mount), this opening once saw almost 3.75M cubic km of water pass in one direction.

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EarthPhoto MIotDc TempSmugmug Day Europe Gibraltar ISS Astronauts Photograph Earth Windows on Earth geo

From iss041e011