Caspian Sea

THE ANSWER
"Caspian Sea from orbit" — Photo by Jeff Schmaltz, MODIS Rapid Response Team, NASA/GSFC / Wikimedia Commons / Public domain
The salt water giant trapped on land.
Despite being called a sea, it is technically the largest enclosed inland body of water on the planet. Its basin is rich in oil and gas.
Explanation
Did you know?
It contains over 40% of the world's lacustrine waters, yet is classified as an endorheic basin.
The 5 Clues
lightbulbClue 1
“A sea that cannot reach the ocean.”
lightbulbClue 2
“It hides treasures of gold and gas beneath its brackish waves.”
lightbulbClue 3
“Surrounded by five nations that cannot decide its classification.”
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“The world's largest inland body of water.”
lightbulbClue 5
“The salty lake bordered by Russia, Iran, and Kazakhstan.”
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