Possible Clues:

• Orch. section
• Orchestra sect
• Bering or Formosa (Abbr.)
• Narrow waterway: Abbr.
• The Bosporus, e.g.: Abbr
• Philharmonic sect
• Bering, e.g.: Abbr
• Bering, e.g.: Abbr.
• Atlas abbr.
• Strait, abbr