The Calore Irpino or Calore Beneventano or Calore River is a river in southwestern Italy. It rises from the Monte Cervialto, elevation 1,809 metres (5,935 ft) above sea level, in the Monti Picentini sub-range of the Apennine Mountains. The river flows first in the province of Avellino, and then in that of Benevento, before flowing into the Volturno. In ancient times it was known as Calor.
On 8 May 663, a large detachment of the army of the Eastern Emperor Constans II, which had invaded the Lombard Duchy of Benevento, was defeated here in battle by the army of King Grimoald, under the joined command of Mitola, Count of Capua, and Grimoald's son, Romuald.
Having already abandoned the siege of Benevento and every small conquest done in Italy, Constans, falling back to Naples, lost any hope to push back the Lombards and re-establish Byzantine sovereignty over southern Italy.
The Calore Lucano (or Calore Salernitano) is a river in Campania, southern Italy, whose course is entirely included in the province of Salerno, within Cilento, for a total of about 63 kilometres (39 mi). It is an important left tributary of the Sele. In ancient times it was known as Calor.
It rises in the northern slopes of Monte Cervati, in the Apennine Mountains and flows through the Parco nazionale del Cilento e Vallo di Diano. For long reaches it flows between high rocky walls, as near Laurino or in the gorge of Monte Pescorubino, between the localities of Magliano Vetere and Felitto.
It empties into the Sele not far from the ancient city of Paestum.
The Calore is one of the few rivers in Europe in which the European otter still lives.
Coordinates: 40°30′18″N 15°01′10″E / 40.50500°N 15.01944°E / 40.50500; 15.01944