Manta season lagoons

Baa Atoll is a UNESCO Biosphere Reserve, and it feels like one — reef systems left alone long enough to fill back up. Seasonal channels bring manta rays close enough to drift alongside, and the resorts here lean private and quiet rather than busy.

• UNESCO biosphere reserve — protected reef systems throughout
• Seasonal manta ray channels, best for slow snorkel drifts
• Private-island resorts with a quieter, more secluded feel