87 dive sites in 14 countries have records of harlequin shrimp.
16 confirmed by two or more independent sources, 71 reported by one source.
Sites are ranked by evidence: first by how many independent divers logged the animal there, then by how many independent sources confirm it. "Best" here means most independently confirmed, nothing more.
All 35 harlequin shrimp sites in IndonesiaDive sites in Indonesia
All 14 harlequin shrimp sites in ThailandDive sites in Thailand
All 14 harlequin shrimp sites in PhilippinesDive sites in Philippines
Harlequin shrimp sites in Costa RicaDive sites in Costa Rica