Question: The name of the province that the Tengis River flows through gets its name from what?

Context paragraphs:
Khövsgöl Province: Khövsgöl (Mongolian: Хөвсгөл ) is the northernmost of the 21 aimags (provinces) of Mongolia.  The name is derived from Lake Khövsgöl.

Basento: 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.

Tengis River: Tengis River (Mongolian: Тэнгис гол ) is a river in the Tsagaannuur sum of Khövsgöl aimag in northern Mongolia.  It runs through the western part of "East Taiga", the northern extension of the Darkhad valley.  The river starts near the Russian border, in the northernmost tip of Mongolia.  It ends as a right hand tributiary of the Shishged River.

Basentello: The Basentello is a river that flows near the border between the Apulia and Basilicata regions of southern Italy.  Its source is near Palazzo San Gervasio.  The river flows southeast and forms part of the border between the province of Potenza and the province of Barletta-Andria-Trani.  It flows into the province of Potenza before entering Lago di Serra del Corvo.  After flowing out of the lake, the river flows into the province of Matera near the border with the province of Bari.  Finally, the river enters the Bradano as a left tributary shortly before the Bradano enters Lago di San Giuliano (a short distance before the Bilioso does the same).

Cesano (river): The Cesano is a river in the Marche region of Italy.  Its source is near Monte Catria on the border between the province of Perugia and the province of Pesaro e Urbino.  The river flows northeast through Pesaro e Urbino before forming the border between Pesaro e Urbino and the province of Ancona for a short distance.  It continues flowing northeast through Pesaro e Urbino and flows past Pergola before becoming the border with Ancona again near San Lorenzo in Campo.  The river flows northeast near Mondavio, Corinaldo and Monte Porzio before the province of Ancona extends westward beyond the bank of the river for a short distance near Mondolfo.  Finally, the river flows into the Adriatic Sea north of Senigallia and south of Marotta and Fano.

Agri (river): 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.

Cheakamus River: 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.

Marecchia: 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.

Bradano: 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.

Bidente-Ronco: The Bidente-Ronco is a river in the Emilia-Romagna region of Italy.  The first portion of the river is called the Bidente.  Once the river passes under the Ponte dei Veneziani (Bridge of the Venetians) in Meldola, the river is called the Ronco.  The source of the river is near the border between the province of Forlì-Cesena, the province of Arezzo, and the province of Florence in the Foreste Casentinesi, Monte Falterona, Campigna National Park.  The river flows northeast through the mountains in the province of Forlì-Cesena and flows near Santa Sofia, Galeata, Civitella di Romagna and Meldola.  Beyond Meldola, the river flows north near Bertinoro, Forlimpopoli, and Forlì before crossing the border into the province of Ravenna.  The river flows northeast until it joins the Montone south of Ravenna, and the resulting river is known as the Uniti.  The Battle of Ronco took place here.

Supporting paragraphs: Tengis River Khövsgöl Province
Answer: Lake Khövsgöl