Isla Mayor, as the nerve centre of the marshlands on the Guadalquivir, has seen a long process of transformation over time due to both the natural evolution caused by silting and the effects of human activity.
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During the 1940s and 50s, the cultivation of rice became the main economic activity on the Isla Mayor del Guadalquivir, with rice fields occupying the northern half of the island (35,000 acres).
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The first attempts to exploit the resources of the Isla Mayor date back to the 19th century, but it was not till the third decade of the 20th century that farming really began in the area, thanks to a comprehensive project carried between 1926 and 1928 by the British company Islas del Rio Guadalquivir Limited.
mayor | Mayor | Mayor of New York City | Lord Mayor of London | Lord Mayor | Mayor of Chicago | Isla Margarita | Mayor of London | Lord Mayor of Dublin | Mayor of the Palace | Isla de la Juventud | Mayor of Pichilemu | Mayor of Los Angeles | Lord Mayor of Belfast | Mayor of San Francisco | Adrienne Mayor | Mayor of Manila | John Phillips (mayor) | World Mayor | Templo Mayor | Mayor of the Sunset Strip | Mayor of Montreal | Mayor of Christchurch | Lord Mayor's Show | Lord Mayor of Liverpool | Isla Verde | Isla Mayor | Isla Fisher | A. Hyatt Mayor | Spanish cruiser Isla de Cuba |
Many of the new villages were given a name related to the nearest river or even a name with an explicit reference to the Caudillo in order to cast a benevolent image of dictator Francisco Franco, like Llanos del Caudillo, Villafranco del Delta, a village in the Montsià comarca nowadays rechristened as El Poblenou del Delta or Isla Mayor near Seville, the former Villafranco del Guadalquivir.