A zoomed in view of the marker shows Chiva itself on a highway directly east of the city of Valencia.
https://mstdn.chrisalemany.ca/system/media_attachments/files/113/397/804/151/086/989/original/3153eed87dc7d8da.png
The town of Chiva, about 50km upland to the east of the City of Valencia is where they recorded the historic nearly 500mm of rain. There are mountains about 50-100km inland of the entire Spanish coast, so the rain accumulates into the river valleys there and floods to the coast.
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