I think it was in Kim Stanley Robinson's book <span style="text-decoration:underline;">Green Mars</span> he has Martian colonist hold a footrace around Mars. There wasn't a course; you just had to stay within a certain distance to the equator.<br><br>
By the time we get to <span style="text-decoration:underline;">Blue Mars</span>, such a race is probably impossible, as the surface of the planet has many great oceans and yes, canals, covering it.<br><br>
Cheers,<br>
Billy