The annual death-rate per Imo for the whole population in 1902 was 21.70.
East of the Niger delta is that formed by the Imo or Opobo, Bonny and other streams, and still farther east is the Calabar estuary, mainly formed by the Cross river.
1000 and Imo that the Jains adopted Sanskrit as their literary language.
East of the Nun the estuaries known as the Brass, Sombrero, New Calabar, Bonny, Opobo (or Imo), &c. (with the exception, perhaps, of the first-named), seem to derive most of their water from independent streams such as the Orashi, rising in about 6° N., which is, however, linked with the Niger by the Onita Creek in 52° N.
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