Both Gumro and Ero
The Brahmani River originates in Jharkhand's Ranchi district as the South Koel River. It has tributaries including Karo, Sankh, and Tikra/Tirka. The Brahmani basin in Jharkhand covers 15,769 sq km and flows towards Odisha. The rivers Gumro and Ero are recognized as local tributaries joining the Brahmani in Jharkhand. Patan is not recorded as a tributary of the Brahmani River in this region.
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