How many venues are involved in the main tournament which is part of the English Cricket Team's 2017-2018 schedule?
English cricket team in Australia in 2017–18:  The Test series will form part of the 2017–18 Ashes series. 2017–18 Ashes series: The 2017–18 Ashes series is a forthcoming series of Test cricket matches to be contested between England and Australia for The Ashes. 2017–18 Ashes series:  The series will be played at five venues across Australia between 23 November 2017 and 8 January 2018.
five