You may be flabbergasted to find out, that under certain circumstances, a trespasser can come onto your land, occupy it, and gain legal ownership of it. The legal terminology for this is "adverse possession."
Till such time, the law relating to adverse possession is either abolished or amended, we in India would continue to be governed by the provisions of the 1963 Act as quoted herein above and the judgments of the Hon’ble Supreme Court on the same issue.