The Guadalmellato is a 110.5 km long river in Andalusia, Spain.

The source of the Guadalmellato is at the Guadalmellato Reservoir where the waters of the Guadalbarbo, Cuzna and Varas meet; these are small rivers bringing waters from the Sierra Morena and subject to seasonal variations.

The Guadalmellato flows roughly southwards for about 5 km into the San Rafael de Navallana Reservoir.

[1] Part of the waters of the Guadalmellato are diverted before it flows into the Guadalquivir by means of a canal that runs parallel to the river.

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