From top to bottom you have the Mawddach, then the Dysynni broadwater and then the Dyfi.
Dyfi estuary
The Dyfi is near to Aberdyfi (Aberdovey).
Mawddach estuary
The Mawddach is near to Barmouth.
Dysynni Broadwater (estuary)
The Dysynni broadwater is near to Tywyn.