There is only one place in the world that hippos can be found in the wild outside of Africa.....Pablo Escobar's house. 

Sources:

https://insightcrime.org/colombia-organized-crime-news/pablo-escobar/

https://thehill.com/changing-america/sustainability/environment/584514-pablo-escobars-80-cocaine-hippos-are-wreaking

https://thehill.com/changing-america/sustainability/environment/538196-pablo-escobars-hippos-breeding-out-of-control-and

https://www.nathab.com/blog/six-surprising-facts-about-hippos-africa/

https://www.pbs.org/wnet/nature/blog/hippo-fact-sheet/