the topography of where I live
I went cycling the other day, out for 10 miles and came home having done 20
It seems to be about a 200+foot climb in less than half a mile, taking me to between 275 and 300 feet above sea level, and I then have to crest one more hill at 350 feet before I’m home (I live at around 250 feet). I know REI provides this kind of thing as well, so I may have to get one there next visit.