[2] Obolo is the indigenous name of a community in the eastern Delta of the River Niger, better known as Andoni (the origin of this latter name being uncertain).
"The first published materials in Obolo language were some almanacs and calendars which were printed in early 1940's"[4] by Andoni Progressive Union.
In 1991, Uche Aaron, in collaboration with the Obolo Language and Bible Translation Organisation, revised the orthography.
Aaron's major contribution to this orthography, apart from some minor improvements, are in the areas of word boundaries and tone marking system.
There are six major dialect groups in the language, namely: (from west to east): Ataba, Unyeada, Ngo, Okoroete, Iko and Ibot Obolo.
"[11] The primary numerals are as follows: 0 - ofok 1 - ge 2 - iba 3 - ita 4 - ini 5 - go 6 - gweregwen 7 - jaaba 8 - jeeta 9 - onaan̄ge ten - akọp hundred - efit thousand - obop million - efie billion - ego trillion - ngwugwu Obolo language is regulated by the Obolo Language and Bible Translation Organization (OLBTO), a community-owned research and development organization that does dialect surveys and research, oversees the development and introduction of new terminologies, publishes books in the language, etc.