Broad Water, or Broadwater (Welsh: Aber Dysynni) is a salt water lagoon near Tywyn, Wales formed from the silted up estuary of the River Dysynni.

This industry was abandoned in the nineteenth century when the estuary became too silted up, forming the lagoon.

[1] The outflow of the lagoon flows beneath a railway bridge before entering Cardigan Bay.

The area is a haven for many wetland birds,[2] and has been designated a Site of Special Scientific Interest.

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