Your most distant known origin (MDKO) is the place of origin of the furthest person who you have documented on a specific genealogical line. In genetic genealogy, it usually refers to the birthplace of someone on a direct maternal line (the mother, her mother, her mother's mother, etc.) or to a direct paternal line (the father, his father, his father's father, etc.). However, where you know your ancestor was the descendant of immigrants but you only know the country of immigration, the MDKO is said to be unknown.