Answer : 3. "Gujarat"
Explanation :

1. The place where Dandi Salt March was carried out is today located in Gujarat state of India.

2. This place is on the coast of Arabian Sea near Dandi city.

3. Dandi March lasted from March 12, 1930 to April 6, 1930.

4. This journey was led by Mahatma Gandhi.

5. The purpose of this journey was to protest against the salt monopoly imposed by the British government.