Mahatma Gandhi broke the Salt Law at Dandi, a coastal town in Gujarat, on 6 April 1930, by manufacturing salt from seawater.
Source: The Salt March and the Civil Disobedience Movement, Chapter 2
The examiner expects just the place name — Dandi — along with one supporting detail (date/method) to show understanding. Writing the full march route (Sabarmati to Dandi) is a bonus but not required for 1 mark. Do not confuse the starting point (Sabarmati Ashram) with the destination where the law was actually broken.