Wild Endeavour was a continent of Gallifrey and the location of the Time Lord Capitol and the mountains of Solace and Solitude. (TV: The Sound of Drums) After Death's messenger had been slain, Presus built a funeral pyre for the dead that could be seen across the whole continent of Wild Endeavour. (PROSE: Blind Fury)
A species of flutterwing was named Wild Endeavour where they presumably existed. (AUDIO: Babblesphere)