This enclosure houses 2 Eastern Atlantic harbour seals, although, in my opinion, it is way too small for them. This enclosure (or another one on the same location) housed swans in the past.
@DelacoursLangur Yes indeed, although the 2 pools differ by only a few square metres/square feet. However, the big difference is that the sea lions have 2 pools, making the total area 1.5 times larger than that of the seals. To make matters even worse, the seal pool also smelled of chlorine, not really optimal for the animals, as they are kept there permanently.