So far, I've only seen 2 pygmy hippo enclosures (that still exist): 1 in Pairi Daiza and 1 in GaiaZoo.
The one in Pairi Daiza is not very good (the female is not too bad but the male has a very bad enclosure, to be honest).
The one in GaiaZoo, on the other hand, is very good. GaiaZoo has bred in this enclosure countless times and the enclosure is large and has enough vegetation. There are also several separation pens. Something that is missing however, is an underwater view, although the enclosure did have this in the past.
Below a part (left side?) of the enclosure:
Another reasonably good pygmy hippo enclosure (but not very popular on Zoochat) is the pygmy hippo enclosure in the Lied Jungle at Omaha's Henry Doorly Zoo:
Another enclosure that is not too bad is San Diego Zoos enclosure:
Search Results for Query: pygmy hippo - ZooChat