Possible Clues:

• Port city built around an old volcano crater
• A study of port
• "... ___ of thieves" (Matthew 21:13)
• Gulf of ___ (entrance to the Red Sea)
• Major oil port
• Port on a gulf of the same name
• Djibouti's Gulf of ___
• Yemeni capital
• Second most populous city in Yemen
• Middle East location : a place for thieves?