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This project is a meeting place for users who share the W3a1a1 Mitochondrial DNA haplogroup, which means they are related along their maternal lines. Users in this group may want to share their family trees with each other to find overlaps and merge duplicate profiles in order to join or expand the World Family Tree and discover new relatives.
Some Ashkenazim carry the mtDNA haplogroup W3a1a1. According to Mark Wade, W3a1a1 "emerged in the Ukraine around 8,500 years ago. One distinct branch, with the 16291 mutation, appeared around 1000 years ago and is today found only among Ashkenazi descendants." Its parent haplogroup, W3a1a, is found among non-Jews in Eastern Europe, East-Central Europe, and Northeastern Europe including Poland, Ukraine, Belarus, and Finland. W3a1a was present among the Yamnaya population that lived in the Sok river region of southwestern Russia circa 3300-2700 B.C.E. according to Extended Data Table 2 in the article "Massive migration from the steppe was a source for Indo-European languages in Europe" by Wolfgang Haak, Iosif Lazaridis, et al. in Nature 522(7555) (June 11, 2015): pages 207-211.
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See more here: [http://www.thecid.com/w3.htm] with an image showing the migration patterns