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A cikin ƙasar Amurka akwai babban tanadi na ruwa mai daɗi, wanda ya ƙunshi tafkuna da koguna. Shahararru da manyan tafkunan kasar sune Lakes Superior, Michigan, Huron, Erie, Ontario, yankin da ke da murabba'in murabba'in 246. Amma ga koguna, akwai da yawa daga cikinsu fiye da tabkuna kuma sun mamaye mafi girma yanki na yankin.
Matsayin ya bayyana mafi tsawo koguna a Amurka.
10 Maciji | kilomita 1
Snake (Kogin Maciji) yana buɗe manyan goma mafi tsawo koguna a Amurka. Snake ita ce mafi girma a cikin kogin Columbia. Tsawonsa yana da kusan kilomita 1735, kuma yankin ruwa yana da murabba'in murabba'in 278. Maciji ya samo asali daga yamma, a yankin Wyoming. Ya ratsa ta jihohi 450 a yankin tsaunuka. Tana da ɗimbin ƙorafi, mafi girma shine Palus mai tsayin kilomita 6. Maciji kogi ne mai kewayawa. Babban abincinsa yana fitowa daga dusar ƙanƙara da ruwan sama.
9. Colombia | kilomita 2
Colombia dake Arewacin Amurka. Mai yiwuwa, ya sami sunansa don girmama jirgin ruwa mai suna, wanda Kyaftin Robert Gray ya yi tafiya - yana daya daga cikin na farko da ya gano kuma ya wuce dukan kogin. Tsawonsa yana da kilomita 2000, kuma yankin ruwan ruwa yana da murabba'in mita 668. km. Tana da rassa fiye da 217, mafi girma daga cikinsu sune: Snake, Willamette, Kooteni da sauransu. Yana gudana cikin Tekun Pasifik. glaciers ne ke ciyar da Columbia, saboda abin da yake da ruwa mai yawa da kuma saurin gudu. Sama da tashoshin samar da wutar lantarki guda goma ne aka gina a yankinta. Kamar Snake, Columbia ana iya kewayawa.
8. Ohio | kilomita 2
Ohio - daya daga cikin manyan koguna a Amurka, shine mafi cikakken kwararar ruwa na Mississippi. Tsawonsa yana da kilomita 2102, kuma yankin ruwan ruwa yana da murabba'in mita 528. km. An kafa tafsirin ta hanyar haɗuwar koguna biyu - Allegheny da Monongahila, waɗanda suka samo asali daga tsaunin Appalachian. Babban yankunanta sune Miami, Muskingham, Tennessee, Kentucky da sauransu. Ohio na fuskantar mummunar ambaliyar ruwa da ke da muni. Ana ciyar da kogin ne da ruwan karkashin kasa, ruwan sama, da ma kogunan da ke kwarara cikinsa. An gina wasu daga cikin manyan tashoshin samar da wutar lantarki a ƙasar a cikin Basin Ohio.
7. Kogin ja ta kudu | kilomita 2
Kudancin Red River (Red River) - daya daga cikin kogin Amurka mafi dadewa, yana daya daga cikin manyan magudanan ruwa na Mississippi. Ya samu suna ne saboda kasa mai yumbu a cikin magudanar ruwa na kogin. Tsawon kogin ja yana da kusan kilomita 2190. An kafa ta ne daga haɗuwar ƙananan kogin Texas guda biyu. An lalata Kogin Red River a cikin shekaru 40 don hana mummunar ambaliyar ruwa. Kogin Red River gida ne ga tafkin Tehomo, wanda aka kafa a sakamakon kafa dam, da kuma kusan. Caddo, kusa da shi shine dajin cypress mafi girma a duniya. Ruwan sama da ƙasa suna ciyar da kogin.
6. Colorado | kilomita 2
Colorado wanda yake a kudu maso yammacin Amurka kuma yana daya daga cikin mafi girma kuma mafi kyawun koguna ba kawai a cikin kasar ba, har ma a duniya. Jimlar tsawonsa ya kai kilomita 2334, kuma yankin ruwa ya kai murabba'in kilomita 637. Farkon Colorado yana ɗauka daga Dutsen Rocky, kuma a cikin Gulf of California yana haɗuwa da Tekun Pacific. Colorado tana da rassa fiye da 137, mafi girma shine Kogin Eagle, Kogin Green, Gila, Little Colorado da sauransu. Yana daya daga cikin kogunan da aka fi sarrafa su a duniya, tare da manyan madatsun ruwa guda 25. An gina na farko a cikin 30 kuma ya kafa Powell Reservoir. A cikin ruwan Colorado akwai kimanin nau'in kifi 1907.
5. Arkansas | kilomita 2
Arkansas daya daga cikin koguna mafi tsawo kuma mafi girma a cikin Mississippi. Ya samo asali ne daga Dutsen Rocky, Colorado. Tsawonsa yana da kilomita 2348, kuma yankin ruwan ruwa ya kai murabba'in mita 505. km. Ya ketare jihohi hudu: Arkansas, Kansas, Colorado, Oklahoma. Mafi girma a cikin Arkansas shine Cimarrock da Gishiri Fork Arkansas. Arkansas kogi ne mai kewayawa kuma tushen ruwa ne ga mazauna wurin. Sakamakon saurin kwarara a yankunan tsaunuka, kogin ya zama sananne a tsakanin masu yawon bude ido da ke son shiga don yin iyo.
4. Rio Grande | kilomita 3
Rio Grande (Great River) shine kogi mafi girma kuma mafi tsayi a Arewacin Amurka. Tana kan iyakar jihohin Amurka da Mexico. Sunan Mexican Rio Bravo. Rio Grande ya samo asali ne daga jihar Colorado, tsaunin San Juan kuma yana gudana zuwa cikin Gulf of Mexico. Mafi mahimmanci kuma mafi girma a cikin ruwa sune Rio Conchos, Pecos, Rivers River. Duk da girmansa, Rio Grande ba ya kewayawa, saboda ya zama mai zurfi sosai. Sakamakon rashin zurfi, wasu nau'in kifi da dabbobi suna cikin haɗari. Rio Grande na iya bushewa a wasu wurare kuma ya samar da ƙananan ruwa, kamar tafkuna. Babban abinci shine ruwan sama da ruwan dusar ƙanƙara, da maɓuɓɓugan dutse. Tsawon Rio Grande yana da nisan kilomita 3057, kuma yankin da basin ya kai murabba'in kilomita 607.
3. Yukon | kilomita 3
Yukon (Big River) yana buɗe manyan koguna guda uku mafi tsayi a cikin Amurka. Yukon yana gudana a cikin jihar Alaska (Amurka) da kuma a arewa maso yammacin Kanada. Tashar ruwa ce ta Tekun Bering. Tsawonsa yana da kilomita 3184, kuma yankin da basin ya kai murabba'in 832. Ya samo asali ne daga tafkin Marsh, sannan ya matsa zuwa kan iyaka da Alaska, yana raba jihar zuwa kashi biyu daidai. Babban yankunanta sune Tanana, Pelly, Koyukuk. Yukon yana tafiya har tsawon watanni uku, saboda sauran shekara yana rufe da kankara. Babban kogin yana cikin wani yanki mai tsaunuka, don haka yana cike da magudanar ruwa. Ana samun nau'ikan kifaye masu daraja irin su salmon, pike, nelma, da launin toka a cikin ruwansa. Babban abincin Yukon shine ruwan dusar ƙanƙara.
2. Missouri | kilomita 3
Missouri (Babban kogin Muddy) shine kogin mafi tsayi a Arewacin Amurka, haka kuma shine mafi girma a yankin Mississippi. Missouri ya samo asali ne a cikin Dutsen Rocky. Yana bi ta jihohin Amurka 10 da larduna 2 na Kanada. Kogin ya kai tsawon kilomita 3767 kuma ya samar da ruwa mai fadin murabba'in mita 1. km., wanda shine kashi shida na dukkan yankin Amurka. An kafa ta ne ta hanyar haɗuwar kogin Jefferson, Gallatin da Madison. Missouri na karbar kusan manya-manyan magudanan ruwa dari, manyansu sune Yellowstone, Platte, Kansas da Osage. An bayyana turbidity na ruwan Missouri ta hanyar wankewa daga cikin duwatsu ta wani rafi mai ƙarfi na kogin. Ana ciyar da kogin da ruwan sama da ruwan dusar ƙanƙara, da kuma ruwan magudanan ruwa. A halin yanzu ana iya kewayawa.
1. Mississippi | kilomita 3
Mississippi shi ne kogi mafi mahimmanci a Amurka, kuma yana matsayi na uku a duniya (a wurin haɗuwa da Missouri da Jefferson tributary) a tsawon bayan Amazon da Nile. An kafa shi a mahaɗar kogin Jefferson, Madison, da Gallatin. Tushensa shine Lake Itasca. Ya mamaye wani yanki na jihohin Amurka 10. Haɗe da babban yankinta, Missouri, yana da tsawon fiye da kilomita 6000. Tsawon kogin ya kai kilomita 3734, kuma yankin rafin ya kai murabba'in kilomita 2. Abincin Mississippi yana gauraye.