Mareños is a regional designation that may refer to Ikoots communities along the coastal lagoons of Oaxaca’s Isthmus of Tehuantepec. Their sound practices should be understood through local languages, celebrations, and community cycles rather than treated as a single uniform tradition. Instruments and repertoires may differ according to occasion and participants. In Mexican Rarities, this category locates documents identified by that historical or regional term. Each item’s notes should be consulted to establish who used the designation, where the music was recorded, and which community took part. The term itself should not replace a community’s preferred name.