An aquatic bird seen on the Nile (5)

I believe the answer is:

aswan

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'the nile' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?

'an aquatic bird' is the wordplay.
'an' becomes 'a'.
'aquatic bird' becomes 'swan' (swan is a kind of aquatic bird).
'a'+'swan'='ASWAN'

'seen on' is the link.

Can you help me to learn more?

(Other definitions for aswan that I've seen before include "Nile High Dam" , "Site of dam in Egypt" , "Site of dam on the Nile" , "Egyptian city and dam" , "Egyptian town and dam" .)

I've seen this clue in The Globe and Mail.

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