What is "aparanta"

Aparanta, or Aparantaka (meaning "Western border") was a geographical region of ancient India, variously corresponding to the northern Konkan, northern Gujarat, Kathiawar, Kachch and Sindh. The Junagadh inscription of Rudradaman mentions that during Ashoka's reign, a Yonaraja (literally; Ionian, or Greek, King), Tushaspa was the governor of Aparanta. A Buddhist text, the Mahavamsa states (xii.5) that at the conclusion of the Third Buddhist Council (c.250 BCE), a Yona (Greek) Thera (monk) Dhammarakkhita was sent here by the emperor Ashoka to preach Dhamma and 37,000 people embraced Buddhism due to his effort (Mahavamsa, xii.34-6). According to Buddhist scholar A.K. Warder, the Dharmaguptaka sect originated here.

Aparanta is regarded as an umbrella term for Shurparakadesha for Konkan, to include in the North and Gomantaka in the south with the river Kundalika to serving as a dividing line in between the two.