At the end of the original film, Rebel ships fly along the Death Star trench in an attempt to blow up the space station. Look at the photo of the Death Star at the top of this post: can you point to the trench that Luke and the Rebels flew down to fire upon the exhaust port that would ultimately destroy the space station?
Nearly everybody points at the equatorial trench of the Death Star. I asked dozens of die-hard fans, including many co-workers at Industrial Light & Magic, and nearly every single person pointed to the equatorial trench. If you asked me, I would also have said the equatorial trench.