The two reef systems are approx 100 km apart giving rise to very different styles of reef formations. Agincourt’s formations offer large wall dives and snorkel sites as well as great bommie and pinnacle sites while Milln, Flynn and Thetford have superb bay like dive/snorkel sites providing spectacular under water sand dunes and remote stepping stone like bommie systems. Milln, Flynn and Thetford are also renowned for the congregation of large schooling pelagic fish such as Mackerel and Tuna.