The Chapayevka (Russian: Чапа́евка) is a river in Samara Oblast, Russia, a left tributary of the Volga. It origins at the slope of Siny Syrt and flows to the Saratov Reservoir, near Novokuybyshevsk, Samara agglomeration. It is 298 km long and its drainage basin is 4,310 km².^[1] The town of Chapayevsk lies along the river. The river is navigable for 34 km, from its mouth to Chapayevsk.^[1] The river has snow feeding and dries up in the upper stream. Since November till April it is used to be frozen. Major inflows are Petrushka, Vetlyanka, Vyazovka.

The river originally was named Mocha. In 1925 it was renamed Chapayevka in honor of the Russian Civil War Red Army combatant Vasily Chapayev.^{[citation needed]}

Fossil remains of Triassic tetrapods are known in the river basin. The first location of fossils was discovered in 1951 opposite the village of Goryainovka, on the right bank of the Chapayevka. Bones of unidentified labyrinthodonts were found in conglomerate outcrops. In subsequent decades, other fossil sites were discovered in this region.^[2]

In the summer of 2020, in the ravine, which flows into Chapayevka 0.8 km northeast of Orekhovka village, another location of Early Triassic fossils was discovered, composed of clays, bone-bearing sandstones and conglomerates. Early Olenekian temnospondyls are known from this locality. Occipital parts of the skulls and the right part of the lower jaw of Benthosuchus sushkini, the right part of the lower jaw of Thoosuchus sp. and fragments of jaws and ribs of unidentified amphibians were collected from these deposits.^[2]

v t e Volga River
Tributaries	Selizharovka Tudovka Vazuza Tvertsa Shosha Dubna Medveditsa Nerl Kashinka Sit Mologa Suda Sheksna Sogozha Korozhechna Kotorosl Kostroma Nyomda Unzha Uzola Oka Kudma Kerzhenets Sura Vetluga Rutka Tsivil Great Kokshaga Little Kokshaga Anish Ilet Sviyaga Sumka Kazanka Kama Aktay Bezdna Bolshoy Cheremshan Sok Samara Chapayevka Little Irgiz Irgiz Tereshka Yeruslan Akhtuba (distributary)
Reservoirs	Lake Volgo Ivankovo Uglich Rybinsk Gorky Cheboksary Kuybyshev Saratov Volgograd
Hydroelectric stations	Ivankovo Uglich Rybinsk Nizhny Novgorod Cheboksary Zhiguli Saratov Volga
Canals	Moscow Canal Volga–Baltic Waterway Volga–Don Canal
Cities	Astrakhan Volgograd Saratov Samara Kazan Ulyanovsk Nizhny Novgorod Yaroslavl Tver

v t e Rivers of Russia by drainage basin
Barents Sea and White Sea (Arctic Ocean)	Iokanga Kem Malaya Belaya Mezen Nautsiyoki Niva Northern Dvina Pinega Sukhona Uftyuga Vaga Vychegda Yomtsa Yug Onega Pechora Usa Ponoy Varzuga Voronya
Baltic Sea	Luga Oredezh Narva Plyussa Neman Šešupė Neva Izhora Mga Okhta Tosna Pregolya Angrapa Instruch Lava Sestra Western Dvina Polota Kasplya Mezha
Lake Peipus	Velikaya Kukhva
Lake Ladoga	Svir Pasha Oyat Syas Volkhov Tigoda Vishera Vuoksi Volchya
Lake Ilmen	Lovat Polist Kunya Msta Berezayka Peretna Uver Pola Shelon
Lake Onega	Andoma Suna Vodla Vytegra
Black Sea	Dnieper Desna Vyazma Don Temernik Manych Sal Donets Khopyor Osered Bityug Voronezh Kuban Bolshaya Laba Mius Mzymta Yeya
Caspian Sea	Kuma Podkumok Sulak Andi Koysu Terek Malka Sunzha Ural Ilek Sakmara Volga Aktay Anish Bolshaya Kokshaga Bolshoy Cheremshan Bolshoy Irgiz Bezdna Chapayevka Dubna Ilet Kama Kashinka Kazanka Kerzhenets Kostroma Kotorosl Kudma Malaya Kokshaga Maly Irgiz Medveditsa Mologa Nerl Nyomda Oka Rutka Samara Selizharovka Sheksna Shosha Sogozha Sok Suda Sura Sviyaga Tereshka Tsivil Tvertsa Unzha Uzola Vetluga Vazuza Yeruslan
Arctic Ocean, east of the Urals	Alazeya Buor-Yuryakh Rassokha Amguema Anabar Bolshaya Kuonamka Malaya Kuonamka Suolama Udya Bogdashkina Chaun Chegitun Chondon Buor-Yuryakh Nuchcha Gusinaya Indigirka Allaikha Badyarikha Bolshaya Ercha Byoryolyokh Chibagalakh Druzhina Elgi Khastakh Kuydusun Kyuyente Moma Nera Selennyakh Shandrin Shangina Uyandina Ioniveyem Khatanga Kheta Kotuy Khroma Uryung-Ulakh Kolyma Anyuy Ayan-Yuryakh Bakhapcha Balygychan Beryozovka Buyunda Debin Korkodon Kulu Omolon Popovka Ozhogina Sededema Seymchan Sugoy Taskan Tenka Yasachnaya Zyryanka Kyuyol-Yuryakh Lena Aldan Batamay Begidyan Belyanka Biryuk Bolshoy Patom Buotama Byosyuke Chaya Chechuy Cherendey Chuya Derba Dzhardzhan Dyanyshka Eyekit Ichera Ilga Khanchaly Khoruongka Kenkeme Kirenga Kuta Kyuelenke Kyundyudey Linde Lungkha Lyapiske Lyutenge Markha Markhachan Menda Menkere Molodo Motorchuna Muna Myla Namana Natara Nuora Nyuya Olyokma Peleduy Pilyuda Sinyaya Sitte Sobolokh-Mayan Suola Tamma Tayura Tikyan Tuolba Tutura Tympylykan Tyugyuene Uel-Siktyakh Undyulyung Ura Vilyuy Vitim Nadym Ob Aley Barnaulka Biya Chaya Chulym Irtysh Kazym Kasmala Katun Ket Kievsky Yogan Parabel Sob Synya Tom Tromyogan Tym Vasyugan Vakh Vatinsky Yogan Olenyok Alakit Arga-Sala Beyenchime Birekte Buolkalakh Bur Khorbusuonka Kelimyar Kuoyka Kyuyutingde Merchimden Siligir Ukukit Omoloy Arga-Yuryakh Kuranakh-Yuryakh Ulakhan-Kyuegyulyur Palyavaam Pegtymel Pur Pyasina Sellyakh Sundrun Maly Khomus-Yuryakh Taz Khudosey Tolka Uele Volchya Yana Abyrabyt Adycha Baky Bytantay Dulgalakh Oldzho Sartang Tykakh Yenisey Abakan Angara Bakhta Bazaikha Bolshaya Kheta Bolshoy Pit Kacha Kan Kem Khantayka Khemchik Kureyka Mana Nizhnyaya Tunguska Podkamennaya Tunguska Sym Tanama Turukhan Yeloguy
Pacific Ocean/Sea of Okhotsk	Amur Amazar Amgun Anyuy Argun Bureya Gorin Gur Shilka Ussuri Zeya Anadyr Belaya Mayn Tanyurer Yablon Yeropol Arman Avacha Khasyn Bolshaya Gizhiga Inya Kamchatka Khatyrka Iomrautvaam Kikhchik Kukhtuy Okhota Ola Paren Penzhina Belaya Oklan Taui Chyolomdzha Tumen Uda Maya Ukelayat Ulbeya Urak Velikaya Yama Yana
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