note). Thus, the Creature's plan to seek "the vast wilds of South America" is compatible
with this meaning.
Compare the OED:
1. An uninhabited and uncultivated tract of country; a wilderness: . . . b. formerly
                  applied more widely to any wild, uninhabited region, including forest-land. 
See also Johnson's definition from the Dictionary of 1755:
DESERT. n.s. [desertum, Latin.] A wilderness; solitude; waste country; uninhabited
                     place. 
Be alive again, 
 And dare me to the desert with thy sword. 
 Of trembling I inhibit; then protest me 
 The baby of a girl. Shakespeare's Macbeth. He, looking round on every side, beheld
                  
 A pathless desert, dusk with horrid shades. Paradise Reg.