The Fontes Tamarici, (Spanish: Fuentes Tamáricas, English: Tamaric Fountains), are three springs located by the geographer and Roman historian Pliny the Elder in classical Cantabria.

The exact year of the construction of the Fontes Tamarici is unknown, but when the Roman Empire conquered Cantabria in 19 BC, they found these sources that drew wide attention.

In his Naturalis Historiae, XXXI, 3, is where he alludes its particularity: The sources, too, of the Tamaricus, a river of Cantabria, are considered to possess certain powers of presaging future events: they are three in number, and, separated solely by an interval of eight feet, unite in one channel, and so form a mighty stream.

The official declaration of historical monument was a no return point for Bellido, a honest and hardworking archaeologist, which left the matter as it was, not to contradict the Francoist authorities nor disenchant the locals with a retraction.

Fernández Acebo[8] proposes that probabilities are high that real Fontes Tamarici might be the impressive intermittent river of La Fuentona ("The big Fountain") in Ruente, Cantabria (Spain) which fits neatly with Plinian description.