Phoible lists four phoneme inventories with the Czech <ř> ([r̝] in IPA), three of which are varieties of Czech and the fourth being Lyélé in Burkina Faso: https

Phoible lists four phoneme inventories with the Czech <ř> ([r̝] in IPA), three of which are varieties of Czech and the fourth being Lyélé in Burkina Faso: https://phoible.org/parameters/1214D761CC44F5F017FD63EA26B45B4B#3/35.66/8.36 https://phoible.org/parameters/1214D761CC44F5F017FD63EA26B45... However, Phoible is not exactly complete. E.g. Wikipedia has a different list: https://en.wikipedia.org/wiki/Voiced_dental,_alveolar_and_postalveolar_trills#Examples https://en.wikipedia.org/wiki/Voiced_dental,_alveolar_and_po...