Isifundo esathi senziwa ngo1969 sithi iAmazon inobude obungama-6,448 eekm. Oku kwathi kwathi kwenziwa umlinganiselo wendawo yomlambo iApurimac. De kwangeminyaka yoo1970, kwakucingwa okokuba umlambo iMarañón kwakuyintsusa yeAmazon.