See below. Should 'the canals' be 'les canaux', not 'ses canaux' which you have as the right answer?

 

Cheers

Matt

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Well done!

I walk along the canals,

The best answer is:Compare your answer

Je me promène à coté dle long de ses canaux, 

You could also say:

je me balade le long de ses canaux, 

Or also:

je marche le long de ses canaux,