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Mystery photo challenge: Where in the world is this port?

updated 11:20 AM EDT, Thu October 27, 2011
Where in the world is this port?
Where in the world is this port?
STORY HIGHLIGHTS
  • The name refers to 'obsidian glass'
  • The body of water is 70 square miles
  • Check the MainSail page for future photo challenges

Editor's note:

(CNN) -- Can you guess where this is? Write your answers at the bottom in the comments section. We will announce the answer Monday on the Mainsail page.

Hint 1: This harbor's name refers to 'obsidian glass'

Hint 2: The harbor belongs to this country's biggest city, but it isn't the country's capital.

Hint 3: The body of water is 70 square miles (180 square kilometers).

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