Ariaca was a region of Western India beyond Barigaza, mentioned in ancient geographical sources.

According to the Periplus of the Erythraean Sea

Periplus of the Erythraean Sea

The Periplus of the Erythraean Sea or Periplus of the Red Sea is a Greco-Roman periplus, written in Greek, describing navigation and trading opportunities from Roman Egyptian ports like Berenice along the coast of the Red Sea, and others along Northeast Africa and India...

, Ariaca was part of the kingdom of Nambanus, though to be the Western Satrap ruler Nahapana

Nahapana

Nahapana was an important ruler of the Western Kshatrapas, descendant of the Indo-Scythians, in northwestern India. According to one of his coins, he was the son of Bhumaka.-History:...

:
Ptolemy

Ptolemy

Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...

 further describes Ariaca as being composed of the cities of Suppara (Sopara

Sopara

Sopara or Soparaka was an ancient port town and the capital of the ancient Aparanta. The site of this ancient town is located near the present day Nala Sopara town in the Thane district of the state Maharashtra, India.Nala Sopara is one of the busiest western suburbs of Mumbai city...

), Dunga, Symilla emporim (Chaul

Chaul

Chaul is a former city of Portuguese India, now in ruins. It is located 60 km south of Mumbai, in Raigad District of Maharashtra state in western India....

), Balepatna, Hippocura, ending before the city of Mandagora.