92 dive sites in 14 countries have records of thresher sharks.
9 confirmed by two or more independent sources, 83 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 43 thresher shark sites in PhilippinesDive sites in Philippines
All 18 thresher shark sites in IndonesiaDive sites in Indonesia
Thresher shark sites in South AfricaDive sites in South Africa
Thresher shark sites in United StatesDive sites in United States