There are at least two on (different fictional versions of) Mars:
Rhysling mentions the Grand Canal in Robert Heinlein's Future History;
another Grand Canal surrounds Mons Olympus in SM Stirling's In The Courts Of The Crimson Kings.
Poul Anderson has a lot of Martians but maybe not any canals?
For James Blish on Martian canals, see Versions Of Mars.
CS Lewis said that he put "canals" on his fictional Mars because "...they are part of the popular tradition." (See here.) However, Lewis' "canals" are deep inhabited river valleys, not artefacts.
It is appropriate that a fictional Mars should have a Grand Canal and that in fact there are at least two. Fictional Mars is a major part of our heritage.