For five hundred years, a Buddhist empire ruled the seas of Southeast Asia from a golden harbour on Sumatra. Srivijaya grew so rich on the trade between India and China that Arab travellers told of a king who threw a brick of solid gold into the water every day — and then the whole empire vanished so completely that the modern world forgot it had ever existed. Bring the rediscovery, the river finds off Palembang, and the hunt for the lost gold of Srivijaya.