The bear enclosure has gone completely - it really only hung on until the bear passed away. It was to the east of what is now the Parrotsphere, where the large emu enclosure is located.
The first shows the Hall and the old Bear pit was behind where you can see the rickety fence on the left. If you were to follow the path straight down towards the Hall you'd see the Flamingos on the left in the small lake.
This other shot clearly shows it filled in, with what is a piece of an original wall belonging to the Hall.