The Nigoglia ( or ; ) is a short Italian river whose source is at the northern end of Lake Orta, of which it is the sole outflow. Its course of less than 2 kilometres passes in a northerly direction through the town of Omegna and into the Strona.
As a rule, the outflows of Italy's major subalpine lakes run in a southerly direction, down to the plains of the Po Valley. The Nigoglia is the exception, seeming to run "upwards" towards the high Alps. This peculiarity gave rise to a motto in the local dialect which is posted on the Omegna town hall, and which is quoted at the end of Gianni Rodari's children's story :
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