Manama lives off what lies underwater, and always has.

01 The country is called "two seas"

The country's name comes from two Arabic words meaning "two seas", and the interesting part is what they refer to. Not to two bodies of salt water, but to the coexistence of two different waters in the same place: the Gulf's, and the fresh water welling up from the seabed through submarine springs.

Those springs are real and were for centuries a practical resource, not a legend. Fishermen dived and filled skins with fresh water out at sea; inland, pipes carried it to the villages. In a desert archipelago where 85 millimetres of rain fall a year, that is not a curiosity: it is the reason there were people at all.

02 Twelve metres of stacked cities

The physical proof of that continuity is at Qal'at al-Bahrain, inscribed on the World Heritage List in 2005. What you visit is not just a fortress: it is an artificial mound twelve metres high made of seven stratified layers, occupied with barely a break from 2300 BC to the eighteenth century.

This was the harbour and capital of Dilmun, the civilisation that organised maritime trade between the Indus Valley and Mesopotamia, and later between China and the Mediterranean. About a quarter of the site has been excavated, and it has produced everything: houses, public buildings, commercial storerooms and defensive structures.

The pale stone fortress crowning the mound, the one in every photograph, is the last thing built, in the sixteenth century, during the Portuguese presence. In other words: what looks like the monument is really the most recent layer of a twelve-metre building made of cities.

03 The second thing that came out of the water

The second extraction is pearls, and here the two stories connect in a way that is hard to believe until it is explained. The oyster beds lay directly above the areas where fresh water rises from the bottom, and it is that mixing of fresh and salt water on the beds that local tradition links to the quality and lustre of these pearls.

For centuries that made this archipelago the centre of the world trade in natural pearls. It was not one activity among others: it was the entire economy, with an annual season, a fleet, a credit system and a social hierarchy all built around going to the bottom to collect oysters.

04 And the third

The third extraction arrived in the twentieth century and changed the scale, not the logic. Oil appeared under the same ground and the same sea, and within a short time it displaced pearls as the source of income. The city you see today from the archaeological site —that line of towers on the horizon— is the direct consequence.

What makes this sequence interesting is that all three extractions can be seen on the same day and within a short distance. The submarine springs, on the coast; the pearl beds and the buildings they financed, on the island next door; and the towers, on the horizon of any photograph you take from the site.

05 What Manama leaves you

What stays with you is not a particular monument: it is a sense of continuity that corrects what you brought with you. You arrive thinking these are new countries, invented in the twentieth century, and you find a mound with seven layers and four thousand three hundred years of continuous occupation, in full view of the cranes.

And a question stays that the island poses itself. Two of the three extractions are already over: the submarine springs have been disappearing and pearl fishing stopped being an economy almost a century ago. The third has an expiry date like all of them. Walking that mound is seeing, very neatly ordered, what comes afterwards.