diff --git a/src/mapper/map_modify.c b/src/mapper/map_modify.c
index 88c82270a..580483203 100644
--- a/src/mapper/map_modify.c
+++ b/src/mapper/map_modify.c
@@ -1192,7 +1192,7 @@ Create_Island(region *r, int * n, const terrain_type * terrain, int x, int y) {
 }
 
 void
-create_island(region *r, int n, terrain_t t) 
+create_island(region *r, int n, const struct terrain_type * terrain) 
 {
 	short sx=r->x, sy=r->y, i, x = 0, y = 0;
 	direction_t d;
@@ -1203,7 +1203,7 @@ create_island(region *r, int n, terrain_t t)
 		r2->msgs = (void *)0;
 	}
 	tradegood = NULL;
-	terraform(r,t);
+	terraform_region(r, terrain);
 	if(r->land) settg(r);
 	r->msgs = (void *)(rand()%6);
 
diff --git a/src/mapper/mapper.c b/src/mapper/mapper.c
index 5c2eb5697..967568e74 100644
--- a/src/mapper/mapper.c
+++ b/src/mapper/mapper.c
@@ -1153,7 +1153,20 @@ movearound(short rx, short ry) {
 				case 'I':
 					a=map_input(0,0,0,"Wieviele Regionen?",0,500,0);
 					if (a) {
-						create_island(r, a, (terrain_t)(rand()%(T_GLACIER)+1));
+            const terrain_type * terrain;
+            int nterrains;
+            for (terrain=terrains();terrain;terrain=terrain->next) {
+              if (fval(terrain, NORMAL_TERRAIN)) {
+                ++nterrains;
+              }
+            }
+            nterrains = rand() % nterrains;
+            for (terrain=terrains();nterrains;terrain=terrain->next) {
+              if (fval(terrain, NORMAL_TERRAIN)) {
+                --nterrains;
+              }
+            }
+						create_island(r, a, terrain);
 						modified=1;
 					}
 					ch = -9;
diff --git a/src/mapper/mapper.h b/src/mapper/mapper.h
index cd1d7da24..c21ce2000 100644
--- a/src/mapper/mapper.h
+++ b/src/mapper/mapper.h
@@ -55,7 +55,7 @@ void showregion(struct region * r, char full);
 int modify_region(struct region * r);
 void NeueBurg(struct region * r);
 void NeuesSchiff(struct region * r);
-void create_island(struct region *r, int n, terrain_t t);
+void create_island(struct region *r, int n, const struct terrain_type * t);
 void make_ocean_block(short x, short y);
 void make_new_block(int x, int y);
 void moveln(const int x);