Marklan is the name given to a part of shoreline in Labrador, Canada, named by Leif Ericson when he landed in North America. Markland, Norse for "forestland" or "borderland", is known to be north of Vinland and south of Helluland. The story is told in the Saga of the Greenlanders. It is generally believed to be Labrador. Ericson's crew cut down trees and took them to Greenland, because Greenland had relatively few trees in the Viking period. Excavation of Viking settlements has shown the presence of birch trees, probably because the climate was then much warmer. It is known as the Medieval Warm Period. Arctic Greenland is however, now well above the Arctic tree line.