In the rule book it defines each league as such:
- Challengers France: France, Monaco, Belgium, Netherlands, Luxembourg
- Challengers UKN: UK, Ireland, Sweden, Denmark, Norway, Finland, Iceland, Malta
- Challengers DACH: Germany, Austria, Switzerland, Liechtenstein
- Challengers Spain: Spain, Andorra
- Challengers East: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czechia, Estonia, Greece, Hungary, Israel, Kosovo, Latvia, Lithuania, Montenegro, North Macedonia, Poland, Romania, Serbia, Slovakia, Slovenia, Georgia, Moldova, Ukraine
- Challengers CIS: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia
- Challengers Türkiye: Türkiye, Azerbaijan, Mongolia, Tajikistan, Turkmenistan, Uzbekistan
- Challengers MENA: Saudi Arabia, Kuwait, United Arab Emirates, Qatar, Bahrain, Oman, Egypt, Lebanon, Iraq, Palestine, Jordan, Algeria, Libya, Morocco, Tunisia.
- Challengers Italy: Italy, San Marino, Vatican City
- Challengers Portugal: Portugal