Question: Which river crossed the city which was at 40 km southwest from Fabro?
Context: Riolo Terme is a "comune" (municipality) in the Province of Ravenna in the Italian region Emilia-Romagna, located about 40 km southeast of Bologna and about 40 km southwest of Ravenna.  The main attraction of the town are the termal baths. Albonese is a "comune" (municipality) in the Province of Pavia in the Italian region Lombardy, located about 40 km southwest of Milan and about 40 km northwest of Pavia.  It has an area of 4.3 km² and, on 31 December 2004, it had a population of 492. The Savio is a river in the Emilia-Romagna region of northern Italy.  Its source is in the province of Forlì-Cesena near Montecoronaro on Mount Castelvecchio which is near the western side of Mount Fumaiolo.  The source is at an elevation of 1126 m and is marked by an iron monument.  A wolf (the symbol of Montecoronaro) and the rings of the "caveja" (the symbol of Romagna) are on this monument.  The river flows near Verghereto and Bagno di Romagna as it winds through the mountains before entering Lago di Quarto.  After leaving the lake, the river flows northeast near Sarsina (near the border with the province of Pesaro and Urbino) and Mercato Saraceno before flowing north.  The river winds for 96 km along the valley.  Its natural track has been preserved relatively well and, in the territory of Cesena, it shows an environment which is one of the purest of the whole Romagna.  North of Cesena, the river crossed the border into the province of Ravenna.  After a total course of 126 km the river enters the Adriatic Sea north of Cervia by Lido di Classe and Lido di Savio. The Yengo National Park is a protected national park that is located in the Lower Hunter region of New South Wales, in eastern Australia.  The 154328 ha park is situated 85 km northwest of the Sydney central business district, 40 km south of Cessnock , 40 km north of Wisemans Ferry , and 155 km southwest of Newcastle . Anthiro (Greek: Ανθηρό ) is a mountain village in the western part of the Karditsa regional unit, Greece.  Anthiro is the seat of the municipality of Argithea.  Anthiro had a population of 462 in 2011.  Anthiro is located 20 km southwest of Mouzaki, 40 km west of Karditsa, and 19 km southwest of Pyli. Torre San Giorgio is a "comune" (municipality) in the Province of Cuneo in the Italian region Piedmont, located about 40 km southwest of Turin and about 40 km north of Cuneo.  As of 31 December 2004, it had a population of 696 and an area of 5.4 km2 . Varda (Greek: Βάρδα ) is a town and a community in the municipal unit of Vouprasia, Elis, Greece.  It was the seat of the former municipality Vouprasia.  The community Varda consists of the town Varda and the villages Kougaiika, Komi, Sympanio and Psari.  Varda is situated in the plains near the Ionian Sea, and east of the Kotychi lagoon.  It is 2 km southeast of Manolada, 3 km southwest of Nea Manolada, 14 km northeast of Lechaina and 40 km southwest of Patras.  The railway from Patras to Pyrgos passes west of the town, and the Greek National Road 9 (Patras - Pyrgos) passes east of the town. Perugia (] ; ) is the capital city of both the region of Umbria in central Italy, crossed by the river Tiber, and of the province of Perugia. Cardè is a "comune" (municipality) in the Province of Cuneo in the Italian region Piedmont, located about 40 km southwest of Turin and about 40 km north of Cuneo.  As of 31 December 2004, it had a population of 1,077 and an area of 19.3 km2 . Fabro is a "comune" (municipality) in the Province of Terni in the Italian region Umbria, located about 40 km southwest of Perugia and about 60 km northwest of Terni.
Answer: Tiber