Institut National de la Statistique et des Études Économiques).
Its map of departmental cases shows how France is split almost down the middle in terms of affected departments.
The below map shows the incidence rate - how many out of 100,000 people test positive for Covid-19 - in the past week in each department. The incidence rate per 100,000 people by department in France. Source: Guillaume Rozier / covidtracker.fr
The national incidence rate is 122.9. This map shows the eastern departments have a rate far higher than this.
For example, Alpes-Maritimes has a rate of 297 and Ardennes has a rate of 281.
In terms of the rate of positive tests, this is the percentage of test results that show a positive case, the east is also generally more affected but there are some departments in the north- and southwest with high rates too.