Paris hosts the New Year’s Eve fireworks and public festivities centered around the Champs-Élysées.
The Champs-Élysées is Paris’s famous avenue running between the Place de la Concorde and the Arc de Triomphe. On New Year’s Eve, large crowds traditionally gather along or near the avenue, while a midnight visual display is projected onto the Arc de Triomphe and fireworks may be used in the celebration. The precise program can vary from year to year for safety, security, or public-health reasons.
Paris’s celebration is sometimes described simply as the Champs-Élysées New Year’s Eve event, although the avenue itself is not a separate city. The Arc de Triomphe is the landmark most closely associated with the midnight projection and countdown imagery.
Other French cities, including Lyon, Nice, and Marseille, hold their own celebrations. They do not, however, match the specific Champs-Élysées setting named in this question.