NetLogo 7.0.0-beta2:

gis:random-point-inside

gis:random-point-inside VectorFeature

Reports a single randomly-generated Vertex that lies within the given feature polygon. Generated points are uniformly distributed within the polygon and both polygon holes and multi-polygon features are supported.

; create 100 turtles randomly distributed throught a VectorFeature `vf`
crt 100 [
  let loc gis:location-of gis:random-point-inside vf
  set xcor item 0 loc
  set ycor item 1 loc
]

Take me to the full GIS Extension Dictionary