The new enclosure is built on Night Safari land that had been set aside for River Safari's future expansion. Refer to the map in the link. The River Safari is where the Axis Deer, Rhino, Water Buffalo and Jackal exhibits used to be. The new elephant enclosure is where the Sambar Deer exhibit used to be.
@DavidBrown The cruise has been suspended since the COVID lockdowns. There's no indication if and when the cruise will resume. In any case, the elephant enclosure in the photo no longer exists.