What are some examples of countries with cenogamy marriage?

Cenogamy, or group marriage, is a form of marriage where multiple partners form a single marital unit. While it is relatively rare, some examples can be found among certain communities and cultures. For instance, the Oneida Community in the 19th century in the United States practiced a form of cenogamy. Additionally, some indigenous cultures and intentional communities around the world may also engage in similar practices, though they are not officially recognized as legal marriages in their respective countries.