Concept:
- The place can be reasoned out instead of memorised, because the act itself decides what kind of place it must have been.
- Making salt without paying tax is possible only where sea water is available.
Step 1: Work out what kind of place was required.
Breaking the salt law meant producing salt outside the government monopoly. That can only be done at the sea shore, by boiling or evaporating sea water. So the place had to be on the coast.
Step 2: Work out which coast.
The march set out on foot from the Sabarmati ashram near Ahmedabad in Gujarat, so the destination had to be a coastal point of Gujarat within walking distance.
Step 3: Name the village.
That village was
Dandi, about 240 miles from Sabarmati, reached on 6 April 1930 after twenty four days of walking.
Step 4: Note why the choice worked so well.
Salt was consumed by every household in the country, so a tax on it touched the poorest as directly as the richest. Breaking that particular law gave the movement a symbol the whole nation understood at once.
Final Answer: The salt law was broken at Dandi in Gujarat.