The distance between Greenland and Iceland began to be a problem and bringing supplies to Greenland became problem. Also, sea power began to go from the Vikings to the Mediterranean sailors. There are stories of piracy in the North Atlantic and even raids on Greenland. Experts agree that Helluland was probably located on southern Baffin Island, Canada. The controversy lies in where Vinland was located.
Theories range anywhere from southern Labrador to Cape Cod, Massachusetts.
There are the remains of a Norse settlement in L'anse aux Meadows, but there are also aspects there that do not match the descriptions of Vinland given in the sagas. Leif Eriksson ordered his crew to make good use of the abundant timber. The other argument is that grapes do not grow in L'anse aux Meadows or anywhere else relatively close. The counterargument to this is that the Norse probably did not know what grapes looked like. They may have thought that the many different kinds of berries that grow in Newfoundland were grapes.