The series, beginning in August, will kick off with a Test match - at Wormsley - and then continue with three NatWest one-day internationals and three Twenty20s.
The team which has accrued the most points in all fixtures, six available for success in the Test and two for a victory in each of the other matches, will win the Ashes.
Clare Connor, head of England women's cricket, said: "The women's game has seen huge growth in interest and profile as a result of the limited-overs formats in recent years.
"The new Women's Ashes Series looks to combine this reality with the prestige and tradition of Test-match cricket.
"We believe that this new multi-format series will gain significantly more profile and context than can be generated by playing a one-off Test match every couple of years."
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