Where was mahavir swami in the last 15 days of his antim chaturmas
According to Jain tradition, Bhagwan Mahavir’s antim chaturmas was at Pavapuri (present-day Bihar), and he attained nirvana there at the end of that period. ( jainknowledge.com)
In simple words: during the last 15 days of his antim chaturmas, he was at Pavapuri. ( jainknowledge.com)