Nānāghāt cave (probably Nāṇeghāṭ; Nāṇe=coin) is in the western ghats of Maharashtra. Many aspects of Nāṇeghāt inscription, for that matter of the Satavahanas, are still unsettled.  However, many consider the Nanaghat inscription now to be belonging to the late 1st Century BCE, as S. Chattopadyaya (1974:35) writes "Nanaghat record is palaeographically later than the Besnagar inscription of Heliodoros of c. 100 BC [...]" 

However, more investigation and further discussion on the issues related to the chronology and origin of the Satavahanas is clearly a desideratum. As Brajadulal Chattopadhyaya (2004:30) remarks "[...] coins from the Amaravathi hoard, the recently discovered Veerapuram (Kurnool dist. of Andhra Pradesh) coins, stray coins from Duvvuru-Athreru or from Vaddamanu -- may date back to the mauryan period. [...] At sites like Kotilingala in Karimnagar dist. and Veerapuram in Kurnool dist. both in Andhra Pradesh, inscribed coins seem to succeed uninscribed coins." Furthermore, he notes(223p.): "[the] distribution pattern of [the Satavahana coins] would indicate the presence of segments of the Satavahana kula in the different areas of the Deccan before the thrust towards western Deccan where the early records of the imperial family are located."