Fossacesia is a city in the province of Chieti in the Abruzzo region of Italy. The town is located on a small hill on the left of the Sangro River's m…Fossacesia is a city in the province of Chieti in the Abruzzo region of Italy. The town is located on a small hill on the left of the Sangro River's mouth, about 2 kilometres from the Adriatic Sea. A historic attraction in the town is the Abbey of San Giovanni in Venere.