Answer: Krishna- Tungabhadra doab
Notes: The bone of contention between the Bahmani and Vijayanagar kingdoms was the Raichur Doab region. This triangular region is located between the Krishna and Tungabhadra rivers in the southern Indian states of Andhra Pradesh and Karnataka. Both kingdoms wanted to control the fertile and rich Raichur Doab. They also wanted to conquer Golconda because of its diamond mines. The Bahmanis were Muslim rulers, while the rulers of the Vijayanagar were Hindus. The Bahmani kingdom was founded by Zafar Khan (Hassan) who took the title of Alauddin Bahman Shah. They ruled from 1347 to 1527.
