This is the area where the grapes are put to dry in the sun:

Una vez recogida la uva, se deposita en las paseras para la práctica del "soleo", para ser pasificada ...
https://www.diariodejerez.es/jerez/vinificacion-vinos-dulces...

Una vez recogida la uva, se deposita en paseras para ser sometida al proceso denominado “Soleo”, colocándolas al aire libre con el objetivo de lograr su pasificación. Esta práctica durará entre siete y quince días, produciendo una pérdida considerable de agua y la consiguiente concentración de azúcar.
http://www.maestrosierra.com/nuestros-vinos/

There doesn't seem to be a specific term in English:

Once harvested the grapes are spread out on paseras, special sites set aside for drying out the fruit in the sun, a process known as "soleo", or sunning.
https://www.sherry.wine/sherry-wine/production/vinification

Bodegas Robles – Drying Pedro Ximénez grapes (La pasera). Grape ...
bodegasrobles.es/drying-pedro-ximenez-grapes-la-pasera-grape-harvest-2017/?lang...
6 ago. 2017 - Bodegas Robles is one of the few wineries that still have their own “paseras”, an area specially selected for the of the grapes.

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Note added at 44 mins (2019-04-18 10:57:04 GMT)
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Yes, but "miles de hectáreas" does not mean just one plantation, it refers to the Cordoba area. And the text is about vino dulce, so it makes sense.