Pointer to structs, C

[xmorg]

Im getting an error when compiling my little "roguelike" attempt game

gcc -o rogue -lncurses *.c
maps.c: In function 'worldgen':
maps.c:131: error: incompatible type for argument 1 of 'regiongen'
*** Error code 1

Here is how its setup. First there are the structs

typedef struct s_region {
  long width;
  long height;
  char *mapname;
  char **data;
} region;

typedef struct s_worldmap {
  long width;
  long height;
  char *mapname;
  char **data; //The characters of the map.
  //Region structs.
  region **wregions; //a w*h array of regions
} worldmap;

Then a function named "worldgen"

int worldgen(worldmap *wm, int height, int width, int mtype) {
....
wm = (worldmap *)malloc( sizeof(worldmap) );
wm->wregions = (region **) malloc(wm->height * sizeof(region *)); //REGIONS
  for(i = 0; i < height; i++)
    {
      wm->wregions[i] = (region *) malloc(wm->width * sizeof(region));
    }

....somewhere within my "for loop"
regiongen(wm->wregions[y][x], wm->height, wm->width, wm->data[y][x]);

regiongen's prototype
int regiongen(region *rm, int height, int width, char maptype);

my question is, is the argument, wm->wregions[y][x] not a pointer to struct?