Figure 1

Map of the Korean Peninsula showing the location of the Imdang burials studied in this paper, and photos showing the site view of the Imdang burial mounds (A), exposure of a double chamber tomb after removing earthen mounds (B), the internal structure of a rectangle main chamber (C) and the other additional square chamber in a double chamber tomb (D) (Photos courtesy of YUM). Maps were created with software ArcGIS v 10.2 (https://www.esri.com/en-us/home).