Kogin Ohio
Kogin Ohio yana da  dogon kogi a ƙasar Amurka . Yana  kan iyakar Midwestern da Kudancin Amurka, yana  gudana ne ta hanyar kudu maso yamma daga yammacin Pennsylvania zuwa iya a kan kogin Mississippi a kudancin Illinois . Shine kogi na uku mafi girma ta hanyar fitar da girma a cikin a ƙasar Amurka kuma mafi girma ta hanyar juzu'in, kogin Mississippi na arewa da kudu mai gudana, wanda ya raba gabas da yammacin Amurka.  Ta hanyar babban rafinta, Kogin Tennessee, rafin ya ƙunshi jihohi da yawa na kudu maso gabashin Amurka,yana daga cikin tushen ruwan sha ga mutane miliyan biyar. 

A cikin shekara ta alif ɗari takwas da talatin1830, Louisville da Portland Canal (da kogin  McAlpine Locks da Dam ) sun ketare rafin, yana ba da damar yin kasuwanci mafi girma da kewayawa na zamani daga Forks na Ohio a Pittsburgh zuwa tashar jiragen ruwa na New Orleans a bakin Mississippi a kan Tekun Fasha. na Mexico. Tun da "canalization" na kogin a cikin shekara ta alif ɗari tara da ashirin da tara1929, Ohio ba ta kasance kogin da ke gudana ba na kyauta; a yau an raba ta zuwa tafkuna 21 masu hankali ko tafki ta kulle 20 da madatsun ruwa don kewayawa da samar da wutar lantarki. 

"Banban Kogi." A cikin Bayanan kula akan Jihar Virginia da aka buga a 1781-82, Thomas Jefferson ya ce: "Ohio shine mafi kyawun kogi a duniya. A halin yanzu ma, ruwa a fili, da ƙirjin santsi kuma ba a karyewa da duwatsu da raƙuman ruwa, misali guda ɗaya kawai banda.”  .