The world’s most expensive island – a man-made 660-acre expanse in the Arabian Peninsula – goes up for sale in UAE. The Marjan Island Ras Al Khaimah has gone on sale for £360million, offering private beaches, five-star hotels and stunning views of the Arabian Gulf. Al Marjan Island, which has gone on the market, is a collection of four man-made expanses in the northernmost of the United Arab Emirates, Ras Al Khaimah.