Subregion in Nederlands East-Indies

Subdivision of Nederlands East Indian or Nederlandsch Oost-Indie

This map shows us that Indonesia region today is based on the Nederlands colonial state. 

Sumatra divided into 11 region including Bangka and Belitung.

Kalimantan (Borneo) divided into 2 region.

Java.

Bali and Lombok.

Lesser Island

Sulawesi divided into 2 region.

Maluku.

New Guinea.