The maps are part of Salvini's campaign to "verify the presence of illegal camps to draw up an eviction plan."
Roma, Sinti, and Camminanti are traditionally nomadic ethnic groups that have lived in Europe for hundreds of years.
According to the Council of Europe, Italy has one of the lowest concentrations of these groups in the EU, with a population of between 120,000 and 180,000, according to the AFP. More than half of these people are Italian citizens who have integrated into mainstream society, AFP claims.
Despite this, hate crimes and prejudice against Roma, Sinti, and Camminanti are rampant, particularly against the less fortunate, some of whom still live in unofficial settlements.
Some 26,000 members of these groups were living in emergency shelters or camps across Italy in 2017, according to the advocacy group Associazione 21 Luglio.
Salvini, who is also leader of the far-right Lega party, has called for non-Italians found amongst the Roma, Sinti, and Camminanti to be rounded up and sent back to their countries of origin.