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.