- Aegean Watershed
- Ionian Watershed
- Alpheus River
- Erymanthus River
- Strait of Corinth Watershed
- Asopus River (Corinthia)
- Mornos River
- Sythas River - Xylokastro
- Aoos/Aous River
- Bay of Patras Watershed
- Achelous River
- Glaucos/Glavkos River - Pan Achaean mountains to south of Patras
- Larissos River - New/Nea Manoláda
- Neda River - Elia-Messenia boundary/border
- Peneus River (Peloponnese)
- Alpheus River
- Mediterranean Watershed
- Eurotas River - southern Laconia
- Eurotas River - southern Laconia
- Achelous River
- Alpheus River
- Andravida Creek
- Aoos/Aous River
- Aretha River
- Asopus River (Corinthia)
- Asopus River (Boeotia)
- Axios River
- Cephissus River (Athens and Piraeus)
- Cephissus River (Eleusis)
- Cladeos River
- Ebros River
- Erymanthus River
- Eurotas River
- Glaucos River/Glavkos
- Larissos River
- Lourdos River
- Mornos River
- Neda River
- Peneus River (Peloponnese)
- Peneus River (Tempe)
- Spercheios River
- Strymon/Strymonas River
- Sythas River