GregW pointed out:
> AFAIK it is flat all the way to Canada from there.
Nope. Open, but not flat. Still good windmill country.
> Suggest looking the town up on google maps street view.
I suggest google maps [Terrain] view after entering "Tucumcari, NM."
You'll start off seeing Tucumcari mountain to the South and mesas to
the North. It's not mountainous, but still a stunning Western scene.
Tucumcari Mountain - Wikipedia, the free encyclopedia
Tucumcari Mountain photo
I've always found the drive in from TX on I-40 very interesting and dramatic.
Right after you enter NM, (after hundreds of miles of flatness and grass in
TX) you descend the side of a mesa and are in a transformed environment.
North of Tucumcari all the way to the CO border is open mesa country
until you see the mountainous ridge that divides CO from NM where there
are volcanos.
Glimpses of Our National Monuments (Capulin Mountain)
After that, it's pretty wide open to Canada, but still not flat all the way.
Even Nebraska provides some relief.
Chimney Rock
Finally, to get to Canada, you will have to navigate around the Black Hills of SD.