Why was the march started by Gandhiji on 11^th March 1930 is referred to as `Dandi March'?

Gandhiji started Dandi March as a campaign against the heavy tax imposed on salt. Gandhiji started this campaign to produce salt from the seawater in the village of Dandi. Hence named Dandi.

He vowed that unless India gets its freedom, he will not return to Sabarmati Ashram. Many regional salt marches took place at the same time under the leadership of regional leaders.