How big was the land area of ??India when it was the largest in history? Where was the border? Which countries were separated from India?

India’s largest land area in history exceeds 4.5 million square kilometers, stretching from Myanmar in the east to Pakistan and Afghanistan in the west, from the Himalayas in the north to the Indian Ocean in the south, and China’s ***, Taiwan, Inner Mongolia , Qinghai and other provinces, neighboring Myanmar and Bangladesh to the south, Bhutan and Sikkim to the southwest, Pakistan and the Kashmir Indus River Basin to the west, China's *** to the north, and China to the northeast Afghanistan and the *** Autonomous Region are neighbors.