Cowrie Shells: 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 matched nowhere else on earth. Small, glossy and almost impossible to forge, it was nature's answer to the minted coin — and for over a thousand years the Maldives held a near-monopoly on it.

Long before the islands carried a single name on a European chart, they were the world's money factory: a mint with no metal, no furnace and no seal — only the slow, reliable arithmetic of the reef.

The method was ancient and patient. Fishermen laid branches of coconut palm in the shallows; the snails crawled onto the fronds; the fronds were hauled ashore and left in the sand until the flesh decayed, leaving pristine white shells behind.

Ibn Battuta, who served as the islands' chief judge in the 1340s, recorded queens keeping royal depots bulging with shells — the medieval equivalent of a central-bank vault, counted out in handfuls rather than ingots.

Arab, Persian and Yemeni ships carried Maldivian cowries as ballast across the Arabian Sea, trading them for the Bengali rice that fed the islands. 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 a reference currency of the transatlantic slave trade.

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.