Pokey Oasis

Pokey Oasis is a supposed level that can be found in Super Mario 64. It is described as a large lake inside a desert with several Pokeys. There are 8 red coins scattered throughout the level that when collected, present the player with a star. There is also a star at the bottom of the lake, though it is surprisingly deep. The sand is light brown, and there are palm trees and the unused Cactus object dotted throughout.

Mario Kart 64 Manifestation
If a Super Mario 64 copy with Pokey Oasis is Stop N' Swopped with Mario Kart 64, Pokey Oasis is unlocked as a playable course, though with a different layout, replacing a random track in the Star Cup (Note: Wario Stadium has not been replaced in any reports). It shares it's music with Kalamari Desert, gains high walls, and an Angry Sun enemy, similarly to Mario Kart DS' Desert Hills track. It is believed that when this track is unlocked, the Personalization A.I. is carried over, as several other anomalies appear, such as an unlockable Magikoopa.