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>A study of 253 men from Tanzania found that the average penis length of Tanzanian males is 11.5 cm (4.5 in).
https://www.auajournals.org/doi/10.1016/j.juro.2013.02.3200

>A study of 115 men from Nigeria found that the average penis length of Nigerian males was 13.37 cm (5.1 in)
https://pubmed.ncbi.nlm.nih.gov/17191423/