The African _bush_ elephant and the African _savannah_ elephant are the same species (i.e., they are just different names for _Loxodonta africana_ ).
According to here and here, the African savanna/bush elephant ( _Loxodonta africana_ ) has a gestation period of 22 months.
The only other African species of elephant, the African forest elephant (*Loxodonta cyclotis), has a gestation period of 20 - 22 months (see here). Both Wikipedia and this source corroborate this higher expected range of 22 months, but with the latter source adding:
> from zoo data a gestation length averaging 660 days has been determined while the average in one wild population (Amboseli) was 656 days.
And for fun, click below for a video of an elephant fetus!
![enter image description here](