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Maho (2009) lists the C141 Enyele (Inyele), C142 Bondongo languages, which do not have ISO codes, as being closest to Bomitaba, as well as C143 Mbonzo (also known as Bonjo or Impfondo), which does have an ISO code.
Bomitaba is spoken in the northern part of the Congo, particularly on the banks of the Likouala-aux-Herbes river north of Epena. South of Epena the people identify as ethnically Bomitaba but speak the Dibole language, as the term 'Bomitaba' likely arose only during the colonial period.
Eberhard, David M., Gary F. Simons, and Charles D. Fennig (eds.). 2023. Ethnologue: Languages of the World. Twenty-sixth edition. Dallas, Texas: SIL International. https://www.ethnologue.com/language/bok/
LEITCH, Myles, and Myles Leich. “LANGUAGE AND DIALECT IN EPENA DISTRICT SOUTH.” Annales Aequatoria, vol. 30, 2009, pp. 808-9. JSTOR, http://www.jstor.org/stable/25836953. Accessed 27 May 2023.