The Acqua Tignese is a stream in the Haute-Corse department of the Corsica region that has its mouth north of Cap Corse, in the Ligurian Sea.

An AEP monitoring station in the town of Ersa, at an altitude of 100 metres (330 ft) and a catchment area of 4.9 square kilometres (1.9 sq mi), studied its hydrology from 1979 to 1999.

The hydraulic problems of the municipalities of the northern part of Cap Corse being more and more worrying, on 21 July 1988, the Corsican Assembly adopted the motion relating to the construction of the Acqua Tignese dam.

[6] A footbridge crosses the river built about fifty meters from its mouth and is used by hikers along the sentier des douaniers and visitors going to the beach of Cala.

[7] The stagnant, brackish and salty waters of the stream near its mouth are home to many protected animal species, amphibians from the anuran (without a tail) and urodela (with tail) groups: the Corsican fire salamander (Salamandra corsica) marginally present on the coast, and the Corsican brook salamander (Euproctus montanus) which are endemic, the Tyrrhenian painted frog (Discoglossus sardus) and the Sardinian tree frog (Hyla sarda) endemic to Corsica, Sardinia, Capraia and Elbe, the Italian pool frog (Pelophylax bergeri) which is expanding from the Pointe du Cap estuarine marshes into the upper course of the streams, finally the European green toad (Bufotes viridis) of the West Mediterranean which lives mainly on the coast, in the marshes and puddles of back dunes.

The Corsican euprocte lives in Acqua Tignese where adults and larvae take refuge in the basins during the dry season.