WAguaytía River
WAndamayo River
WCallumayo
WCantumayo
WCaplina River
WChanchamayo River
WChillón River
WChinchey
WColca River
WCunas River
WDesaguadero River (Bolivia)
WEne River
WHatun Mayu
WHeath River
WHuarmey River
WInambari River
WItaya River
WJavary River
WJequetepeque River
WJuruá River
WLawriqucha River
WLos Amigos River
WLurín River
WManú River
WMayo River (Peru)
WNanay River
WOcoña River
WPachachaca River
WPachitea River
WPakaymayu
WPerené River
WQañawimayu
WQuilcayhuanca
WRímac River
WSanta Cruz Creek
WTahuamanu River
WTambo River (Peru)
WTambopata River
WTapiche River
WTigre River
WTumbes River
WUchusuma River
WUrqumayu
WUtcubamba (river)
WXapuri River
WYanamayo
WYuraqmayu (Lima)
WZarumilla River