Mystery photo challenge: 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

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).