Dutch colonial architecture in Indonesia were built across the archipelago that once was known as Dutch East Indies. Most of the better and permanent colonial era structures are located in Java and Sumatra, which were economically considered more important during the Dutch imperial period. As a result, there are large number of colonial buildings concentrated in its cities. Plenty of old VOC era forts and warehouses are also scattered throughout the archipelago, particularly around Maluku Islands and Sulawesi. There are three Dutch colonial architectural styles: