Question: What river flows through 9 counties in states in the U.S. and is also a tributary to the Swannanoa River?

Context articles: Swannanoa, North Carolina
Cixerri
Agri (river)
Marecchia
Kosasthalaiyar River
Cheakamus River
Bradano
French Broad River
Basento
Swannanoa River

Swannanoa is a census-designated place (CDP) in Buncombe County, North Carolina, United States.
 The population was 4,576 at the 2010 census.
 The community is named for the Swannanoa River, which flows through the settlement.
 It is part of the Asheville Metropolitan Statistical Area.
The Cixerri is an Italian river in southern Sardinia province of Cagliari.
 It springs from Monte Croccoriga, at 313 m above sea level, in the province of South Sardinia.
 The river flows into a lake north of Iglesias and then exits the lake and flows eastward.
 The river is joined by a tributary north of Villamassargia and south of Musei before entering the province of Cagliari.
 The river flows past Siliqua and is joined by another tributary from the south.
 Finally, the river enters the Stagno di Cagliari close to the mouth of the Mannu River near Assemini.
The Agri is a river in the Basilicata region of southern Italy.
 In ancient times it was known as "Aciris" (Ancient greek: "Akyris", "Ακυρης").
 The source of the river is in the Lucan Apennines north of Monte Volturino and west of Calvello in the province of Potenza.
 It is near the source of the Basento.
 The river flows south near Paterno before curving southeast.
 It flows near Tramutola, Viggiano, and Grumento Nova before entering a lake.
 After exiting the lake, the river flows eastward near Armento, Missanello, Aliano, and Sant'Arcangelo.
 A right tributary, the Racanello, enters the river in this area.
 The river forms the border between the province of Potenza and the province of Matera for part of this area of the river.
 It flows into a small lake before entering the province of Matera.
 The river flows for a short distance before entering Lago di Gannano.
 After exiting the lake, the river flows southeast near Tursi, Montalbano Jonico, and Scanzano Jonico before flowing into the Gulf of Taranto near Policoro.
The Marecchia (pronounced ] ) is a river in eastern Italy.
 In ancient times it was known as the "Ariminus" which was from the Greek "Ariminos", "Αρίμινος" (which is also the ancient name of Rimini).
 The source of the river is near Monte dei Frati which is east of Pieve Santo Stefano and southwest of Badia Tedalda in the province of Arezzo in Tuscany.
 It flows northeast into the province of Pesaro and Urbino in the Marche and is the only river that runs through Montefeltro.
 While flowing through Montefeltro, the river flows through the exclave Santa Sofia Marecchia, which belongs to Badia Tedalda.
 The river then flows past Sant'Agata Feltria and Novafeltria before crossing into the province of Rimini in Emilia–Romagna.
 At Torello, part of the commune of San Leo, it flows 1 km west of the Sammarinese territory Acquaviva and the San Marino River flows into it, but the Marecchia does not touch the San Marino border.
 Finally, the river flows past Verucchio and Santarcangelo di Romagna before flowing into the Adriatic Sea near Rimini.
Kosasthalaiyar River, also known as "'Kortalaiyar" in Manali a distributary, is one of the three rivers that flow in the Chennai metropolitan area.
 The 136 km river originates near pallipet in thiruvallur District and drains into the Bay of Bengal.
 Its northern tributary Nagari river originates in Chitoor district of Andhra Pradesh and joins the main river in the back waters of Poondy dam.
 Its catchment area spreads in Vellore, Chitoor, North Arcot, Thiruvallur and Chennai districts.
 It has catchment area in North Arcot District with a branch near Kesavaram Anicut and flows to the city as Cooum River and the main Kosasthalaiyar River flows to Poondi reservoir.
 From Poondi reservoir, the river flows through Thiruvallur District, enters the Chennai metropolitan area, and joins the sea at Ennore creek.
 There are two check dams across the river at Tamaraipakkam and Vallur.
 The excess discharge in the river is controlled by the Tamarapakkam Anicut located across the river in the downstream of Poondi reservoir.
 Vallur Anicut is a small check dam constructed near Minjur across the river to control water levels and feed irrigation channels in the area.
 It flows to a distance of 16 km in the Chennai metropolitan area.
 The total catchment area of the river is 3757 km , and the bed width ranges from 150 to .
 The discharge capacity of the river is 110000 m3/s , and the anticipated flood discharge capacity is about 125000 m3/s .
The Cheakamus River (pron.
 CHEEK-a-mus) is a tributary of the Squamish River, beginning on the west slopes of Outlier Peak in Garibaldi Provincial Park upstream from Cheakamus Lake on the southeastern outskirts of the resort area of Whistler.
 The river flows into Cheakamus Lake before exiting it and flowing northwest until it turns south and enters Daisy Lake.
 Between the outlet of Daisy Lake and its mouth, much of its length is spent going through Cheakamus Canyon, where the river flows through swift rapids and even one good sized waterfall.
 The river flows south from the lake and through the canyon before joining the Squamish River at Cheekye, a few miles north of the town of Squamish.
 The river's name is an anglicization of the name of Chiyakmesh ("people of the fish weir"), a village of the Squamish people and a reserve of the Squamish Nation.
The Bradano is a river in the Basilicata and Apulia regions of southern Italy.
 Its source is Lago Pesole (which is near Forenza and Filiano) in the province of Potenza.
 The river flows southeast near Monte Torretta, Acerenza, and Oppido Lucano.
 After crossing into the province of Matera, it is joined by a right tributary, the Alvo.
 The river flows near Irsina before being joined by a left tributary, the Basentello.
 Shortly after that, it is joined by another right tributary, the Bilioso.
 The river then enters Lago di San Giuliano.
 After flowing out of the lake, the Bradano is joined by a left tributary, the Gravina, and flows southeast near Montescaglioso before entering the province of Taranto.
 It is then joined by a left tributary, the Gravina di Matera, before re-entering the province of Matera after a short distance.
 The river flows near the border with the province of Taranto before entering the Gulf of Taranto near Lido di Metaponto.
The French Broad River flows 218 mi from near the town of Rosman in Transylvania County, North Carolina, into the state of Tennessee.
 Its confluence with the Holston River at Knoxville is the beginning of the Tennessee River.
 The river flows through the counties of Transylvania, Buncombe, Henderson, and Madison in North Carolina, and Cocke, Jefferson, Sevier, and Knox in Tennessee, and drains large portions of the Pisgah National Forest and the Cherokee National Forest.
The Basento (Latin "Casuentus") is a river in the Basilicata region of southern Italy.
 It rises at Monte Arioso in the southern Apennine Mountains, southwest of Potenza in the province of Potenza.
 The river flows northeast near Pignola and Potenza before curving east near Vaglio Basilicata.
 It curves southeast and flows near Brindisi Montagna, Trivigno, and Albano di Lucania.
 A right tributary coming from Lago di Ponte Fontanelle flows into the river in this area.
 The river forms the border between the province of Potenza and the province of Matera for a short distance before flowing into the province of Matera.
 It flows eastward near Tricarico, Calciano, and Grassano before curving southeast.
 The river flows near Grottole, Miglionico, Pomarico, Ferrandina, and Monte Finese before curving eastward.
 It flows near Pisticci and Bernalda before flowing into the Gulf of Taranto, which is part of the Ionian Sea, near Metaponto.
 The main city on the Basento is Potenza, the capital of Basilicata.
The Swannanoa River flows through the Swannanoa Valley of western North Carolina, and is a major tributary to the French Broad River.
 It begins at its headwaters in Black Mountain, NC, however, it also has a major tributary near its headwaters: Flat Creek, which begins on the slopes of Mount Mitchell.
 The Swannanoa River ends when it meets the French Broad at Biltmore Estate in Asheville.
 The river is 22 miles or 35 kilometers long, and it flows entirely within the geographical boundaries of Buncombe County.
 It is a valuable resource to the county, providing drinking water to the Asheville metropolitan area, and numerous recreational opportunities.
 In September 2004, massive rains from the remnants of Hurricane Frances and Hurricane Ivan caused the Swannanoa to flood, causing major damage to the Biltmore Village section of Asheville, and to the other communities that it flows through.