Before revision: The term "India beyond the Ganges" (India extra Gangem) was the archaic term from Ptolemy frequently used by earlier geographers to refer vaguely to Southeast Asia (roughly from Burma down to the Malay peninsula ); the Indian subcontinent proper was referred to as "India within the Ganges" (India intra Gangem).Mitchell's Ancient Geography (1868: p. 55) Thus the islands of "India beyond the Ganges" claimed to have been reached would roughly correspond to modern Indonesia or thereabouts.
After revision: The term "India beyond the Ganges" (India extra Gangem) was the archaic term from Ptolemy frequently used by earlier geographers to refer vaguely to Southeast Asia (roughly from Burma down to the Malay Peninsula ); the Indian subcontinent proper was referred to as "India within the Ganges" (India intra Gangem).Mitchell's Ancient Geography (1868: p. 55) Thus the islands of "India beyond the Ganges" claimed to have been reached would roughly correspond to modern Indonesia or thereabouts.