There is a confirmed connection between the Spyro Universe and the Crash Universe. The exact nature of this connection is unknown. Something about an underground portal.

Border Realms

• Arctic Cliffs
• Fire Mountain
• Tech Park
• Adventure Islands - Three islands that exist in the sea between the Universes. They have become popular vacation spots for people of both universes. There are many adventursome activites and games. Not quite as popular with the Dragons as Dragon Shores.
  • Spyro Island
  • Crash Island
  • Speed Island - so named for the many dirt race tracks.

Known Parts of the Crash Universe

• Wumpa Jungle
• Velo's Race Tracks - Velo's Race Tracks were built by the intergalactic Emperor Velo to entrtain his citizens. Crash, Cortex and their friends and minions were transported here to provide entertainment for Velo.
• The Twins' Fortress*

*The Twins' Fortress is within "The 10th Dimension" which is an alternate universe. Though it is another Universe it is an alternate version of the Crash Univeres and is therefore considered part of the Crash Universe (or Multiverse) rather than the Spyro Universe.

For more info on the Crash Universe check out these sources:

Crash Bandicoot (PS1)
Crash Bandicoot 2: Cortex Strikes Back (PS1)
Crash Bandicoot (3): Warped (PS1)
CTR: Crash Team Racing (PS1)
Crash Bash (PS1)
Crash Bandicoot: The wrath of Cortex (PS2, Gamecube, XBox)
Crash Blast (N-Port)
Crash Bandicoot: The Huge Adventure (GBA)
Crash Bandicoot: N-Tranced (GBA)
Crash Nitro Cart (PS2, Gamecube, XBox, GBA, N-gage, Wonderphone)
Crash Bandicoot Purple: Ripto's Rampage (GBA)
Crash Bandicoot (in-fusio)
Crash Twinsanity (Xbox,PS2)