▁Pl ata , ▁along ▁the ▁coast ▁of ▁Uruguay . ▁In ▁ 1 5 1 6 , ▁Sol ís ▁dis emb ark ed ▁on ▁the ▁Uruguay ▁coast ▁shortly ▁after ▁entering ▁the ▁Uruguay ▁River , ▁along ▁with ▁six ▁other ▁men . ▁The ▁local ▁Ch arr ú as ▁saw ▁them ▁and ▁killed ▁them ▁in ▁a ▁swift ▁surprise ▁attack . ▁A ▁boy , ▁Francisco ▁del ▁Puerto , ▁was ▁sp ared ▁because ▁of ▁his ▁young ▁age . ▁The ▁remaining ▁sail ors ▁left ▁and ▁returned ▁to ▁Europe . ▁ ▁Del ▁Puerto , ▁who ▁was ▁left ▁behind , ▁lived ▁for ▁ten ▁years ▁among ▁the ▁ind igen ous ▁people . ▁He ▁was ▁res cu ed ▁by ▁a ▁subsequent ▁European ▁voyage ▁led ▁by ▁Sebastian ▁Cab ot . ▁Del ▁Puerto ▁told ▁Cab ot ▁rum ors ▁of ▁a ▁" white ▁king " ▁and ▁a ▁mountain ▁of ▁silver ▁that ▁was ▁located ▁north ▁of ▁the ▁Par an á ▁River . ▁Cab ot ▁considered ▁the ▁tale ▁to ▁be ▁true , ▁and ▁dropped ▁his ▁initial ▁orders ▁( to ▁seek ▁a ▁path ▁to ▁the ▁Ind ies ▁shorter ▁than ▁the ▁one ▁found ▁by ▁Mag ellan - El cano ) ▁in ▁order ▁to ▁look ▁for ▁the ▁mountain . ▁The ▁rum or ▁was ▁ultimately ▁proved ▁to ▁be ▁false ; ▁there ▁were ▁no ▁pre cious ▁met als ▁in ▁the ▁La ▁Pl ata ▁bas in . ▁But ▁the ▁European ▁belief ▁in ▁the ▁rum or ▁was ▁one ▁of ▁the ▁reasons ▁for ▁the ▁name ▁of ▁Argentina . ▁ ▁Est ab lish ment ▁The ▁San ct i ▁Sp ir itu ▁fort ▁was ▁built ▁next ▁to ▁the ▁Car