A giant, yellow, inflatable duck which popped up on the Whanganui River on Friday night had tongues wagging in town all weekend.

Daniel Goldsworthy launched the duck - which took three hours to inflate - below Whanganui City Bridge to promote next Saturday's raft race, which he is running.

Teams of at least four will race down the river on homemade rafts. The $50 entry fee will go to charity with cash prizes up for grabs.

Mr Goldsworthy said the duck had been the talk of social media.

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"It seems to have gone a bit viral."

The race has more more than 20 entries so far and people have until Friday to enter via the Plumber Dan Facebook page or email: plumberdanltd@gmail.com