Dating geographia maps
The town is near the former seat of the Minangkabau royalty established by Adityawarman, the king of Malayapura (Letter Kingdom of Malay) in Pagaruyung in the 13th century, represented by the reconstructed Pagaruyung Palace.
The town has the richest stone inscriptions in Sumatera left by Adityavarman.
Hence, three separate identifications are made, as follow.
The region of Aurea Chersonesus contains places names, a trading place ( Batusangkar is the capital of the Tanah Datar Regency in West Sumatera Province, known as “the city of culture”.
Ptolemy, like many early geographers, believed the Indian Ocean to be a closed sea and maps based on Ptolemy’s work show Aurea Chersonesus to be located within a closed basin, though by the 8th century, Arab geographers were aware that the idea of the Indian Ocean as a close basin was mistaken.
The series of maps contain twelve maps on Asia, in which the eleventh map (hence the name Undecima Asiae Tabula) depicts India Extra Gangem (India beyond the Ganges River) and Sinae (China).
There is a region on the map labeled Aurea Chersonesus.
The latitudes of the places around the Aurea Chersonesus are only a few degrees from the equator, either south or north, or considering the method for measuring the latitudes in the time, it can be generally said that the region is in the proximity of the equator.Before this, maps in various forms, including wall paintings and rock carvings, were a rudimentary form of cartography.