The entire(!) size of the "Erweiterungsgelaende" in Berlin is dedicated with 3.4 hectares (= about 8.5 acres), so about 2 acres bigger...
Afaik (=if my memory is correct), Congo is/was filled with 1 enclosure for Colobus, 1 enclosure for okapis, 1 enclosure for mandrills, guegnons and red river hogs and 2 for gorillas (plus a few indoor enclosures for birds, reptiles, amphibians, fishes and invertebrates).
You can find the infos here: ZooLex Exhibit - Congo Gorilla Forest
Afaik (=if my memory is correct), Congo is/was filled with 1 enclosure for Colobus, 1 enclosure for okapis, 1 enclosure for mandrills, guegnons and red river hogs and 2 for gorillas (plus a few indoor enclosures for birds, reptiles, amphibians, fishes and invertebrates).
You can find the infos here: ZooLex Exhibit - Congo Gorilla Forest

