The natives are Sundanese, except in the northern or Serang division, where they are Javanese.
To it Sundanese stands in the relation that Low German holds to High German, and the Madurese in the relation of a strongly individualized dialect.
It differs considerably from the other members of the Sundanese group both in the direction of its main axis and in the prevalence of old rocks and slighter volcanic character.
It comes, however, within the great volcanic zone which stretches from the north of Sumatra, through Java and the other Sundanese islands, round to Amboyna, Tidore, Ternate, Halmahera and the Philippines.
The natives belong to a Sundanese group, but in the north contain a large admixture of Malays.