Possible Clues:

• Triangular islands at mouths of rivers
• Some fraternity members
• Triangular patches of land at mouths of rivers
• Sites of big deposits
• The Dee might have one of them 96)
• The sort of mouths the sort of 2 down may have
• Triangular land patches at river mouths
• River mouth areas
• Pointed river formations
• Foreign characters lasted with difficulty