Hippos are a very popular animal to view on safari. Fortunately they are well represented in major safari areas containing water resources. Hippos make fantastic honking noises, and they are often observed making threat displays (hippo yawns) or having mock battles with one another. Hippo pools make a great location to stop for a picnic or sundowner as they provide great game viewing.
The Mara River in Tanzania has great hippo viewing, and often interesting interactions with crocodiles or migration herds crossing the river. An interesting unusual view takes place at Katavi National Park where hundreds of hippos try to crowd into disappearing water areas late in the dry season.
Other Areas of Note
Most major parks and game reserves that have good water resources.