The World's First Global Currency.

The money cowrie (Monetaria moneta) bred in the warm, predator-free lagoons of Haddhunmathi, Huvadhu and Ari atolls in quantities unmatched anywhere on earth. For over a thousand years, the Maldives held a near-monopoly on the world's earliest fiat currency.

The harvest was ancient and systematic. Branches of coconut palm were laid in the shallows; the snails crawled onto the fronds; the fronds were hauled ashore and left until the organic matter decayed, leaving pristine white shells. Ibn Battuta noted that the Sultanas kept royal depots bulging with them — the medieval equivalent of a central bank vault.

Arab, Persian and Yemeni ships carried Maldivian cowries as ship ballast across the Arabian Sea, exchanging them for Bengali rice that sustained the Maldivian population. By the 16th and 18th centuries, Portuguese and other European traders had co-opted the network, pumping Maldivian shells into West Africa where they became the primary reference currency in the transatlantic slave trade.

The scale is staggering. The scholar Bin Yang called the Maldives the epicentre of a 'cowrie money world' that stitched the Indian Ocean to the global economy for fifteen centuries — until colonial demonetisation and the abolition of the slave trade finally collapsed the system in the 19th century.