Waterkasteel (Batavia)

[1] The objective of this fortress construction was to provide defense at the entrance of Ciliwung because the anchor points had been moved far away from the fortress due to the formation of shoals in front of the estuary and the widening of the coastline.

This foundation was not strong enough to hold the fortress walls, and therefore in 1750 this structure was refurbished and reconstructed.

It was made of coral reef, equipped with barracks, armed forces, and a number of cannon.

There were 50 spots for cannons along the top of the fortress wall and eight semi-circular lookout towers, which was called "Rondeel" by local missionary pastor, Johan Maurits Mohr.

On the southeast bastion, there are two rectangular plots identified as having been the fortress commander's residence and the troop barracks.