regions are identified and self-identified as distinct sub-group known as ‘Orang Pesisir’ or ‘Batak Pesisir’ and ‘Batak Pardembanan’ (Asahan). In some cases of conversion to Islam, there are occurrences of Toba Batak Muslims disassociating themselves with Toba Batak customs and identity and prefer association with other ethnic identities (e.g. of their spouses) or to disassociate ethnic identity at all. This would cause the departure from the traditional Toba Batak customs and adoption of the more conventional Islamic customs in instances such as wedding or burial, as many aspects of the former are now seen as no longer compatible with Islamic standard. See also Toba medicine container References Further reading Giglioli, Henry Hillyer (1893). Notes on the Ethnographical Collections Formed by Dr. Elio Modigliani During His Recent Explorations in Central Sumatra and Engano in Intern. Gesellschaft für Ethnographie; Rijksmuseum van Oudheden te Leiden (1893). Internationales Archiv für Ethnographie volume VI. Getty Research Institute. Leiden : P.W.M. Trap. Ethnic groups in Indonesia Ethnic groups in Sumatra History of Sumatra Ethnography Batak Batak ethnic groups