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

October 27, 2011 -- Updated 1520 GMT (2320 HKT)
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: From bustling harbors to sleepy seaside marinas, CNN's monthly sailing show, Mainsail, brings you a mystery port photo each week. With a few clues to guide you in the right direction, can you work out our next mystery location?

(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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