In which Kshetra ravana will become tirthankara
Ravana is not recognized as a Tirthankar in Jain scriptures. There are exactly 24 Tirthankaras in each time cycle, and Mahavira is the 24th. The traditional Jain canonical texts do not assign Ravana a future Tirthankar status or a specific Kshetra for such an attainment. So, there is no authentic Jain answer that names a Kshetra in which Ravana becomes a Tirthankar.