Tech de Ra: Gran Canyon, Arizona; Talons Junction: Industrial research park, United Kingdom.

It's right in the descriptions, here's how you do it:
  • Go to WipEout Pulse website
  • Select language
  • Go to the "Tracks" section
  • Click on the hexagon corresponding to the track you're looking for (Two hexagons, one for Forward, the other for Reverse)
  • Read description
  • ?????????
  • PROFIT!