 The area covered by the Sunda kingdom until early in the 16th century

Based on the travel records of Prince Bujangga Manik, a Hindu Sundanese monk who visited all of the holy Hindu sites in Java and Bali islands at the beginning of the sixteenth century AD, in his lontar manuscripts, which are saved in the Bodleian Library of Oxford University of England since the 16th century, the border of the Sunda kingdom in the west is the Sunda Strait and in the east is the Cipamali River (present day Brebes River) and Serayu River in Central Java Province.Historical record

The earliest time of a reference to the name Sunda being used to identify a kingdom, is written on the Prasasti Kebon Kopi II stone inscription of 458 Saka (536 AD) and copperplate letters of the fifteenth century with royal instructions telling the existence of the Sunda kingdom.Another reference to the kingdom is the Sanghiyang Tapak inscriptions.