Indonesia's Coral Triangle is the seahorse capital of the world, with the most species diversity anywhere on Earth. The Lembeh Strait off northern Sulawesi is legendary 'muck diving' territory, where skilled guides reliably find Bargibant's, Denise's, and Pontoh's pygmy seahorses — miniature species under 2 cm long that cling to specific gorgonian coral hosts. Raja Ampat further east adds weedy and common seahorses among its dazzling biodiversity. Bring a magnifying glass or macro lens — these animals are the masters of camouflage, often invisible until a guide points them out from centimetres away.