This field should be for deer or antelope, but primates being here is a waste of space. To top it off the spacious yard is for a silverback that spends 24-7 completely alone.
This is certainly a lot better now than when pictured above. There are climbing structures, it is grassy, and the troop is average size, mixed with black-and-white colobus monkey.
I'm guessing, based on the posts above and the photo itself, that this was previously two separate islands which has been turned into one large enclosure?