When Shango found out what Ọba had done he, furious, screamed and Osun and Oba fled frightened, turning into the two rivers.

[3] The Ogbomoso Reservoir on the Oba River was completed in 1964, covers an area of 137.6 hectares (340 acres) and has a storage capacity of 3,520 megalitres (124×10^6 cu ft).

[4] The dam is fed by the Idekun, Eeguno, Akanbi Kemolowo, Omoogun and Yàkù streams, and has a catchment area of 321 square kilometres (124 sq mi).

Settlements along its course from north to south include Apo, Iluju, Obada, Mosunmade, Otuokun, Bale, Olori and Olumoye.

[5] The climate in the upper part of the river around Ogbomoso has consistently high temperatures, with moderate to heavy rainfall in March–July.

[6] A study published in 2014 found that the fish in the Ogbomoso Reservoir were infected with parasites that could cause a risk to human consumers.

Irrigation farming is unusual in the region since rainfall is fairly plentiful, but is common in the northern states where the farmers originate.