searching for Purna River in Wikipedia yielded 3 results.:-
Purna River 334 kms Tributary of Godavari in Maharashtra State.
Purna River 296 kms. in Gujarat State passing by Navsari.
Purna River 373 kms Tributary of Tapi in MP state.
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more... we have 11097/98 7 22149/50 Pune-ERS trains named after Poorna River. That makes it 4 the Purna River in India.