It is informative to compare different traditions by "energy centers", that have physiological and anatomical background. Physiologically the Man is always the same - in China and in Africa, and all the ideas of similarity of the Universe and the Man must repeat the energy structure of the Man !
Regarding the sefirot and chakras, the basic four are obvious and do not require discussion.
To these it is possible to add
or (an alternative view)
Binah is the separation between "The highest" and "the lowest", and is divided in two parts by parsa, (barrier) so, it seems to be the throat.
Why ? Well, here we use the Chinese point of view, which also employs energy centers that can be interpreted as chakras. It also has the eight "Extra-channels" correspond to 8 trigrams and to perform the back middle line, forward middle line, and some energy connections (for example from the foot to the head). I do not have the place here to explain the theory of 8 extra-channels (I refer to the books of Acupuncture), but they are also real and can be measured, and used in medical treatment. The "Control" from 8 channels is 8 corresponding points at the foot and the hand. All 8 channels are connected in the navel. So, the navel is the center of "extraordinary energy", that circulated via the middle lines, and has representation on 4 extremities. The "Large orbit" known also from Qi-Gong (Chinese equivelant to the Indian pranayama) involves 8 such channnels, and its training means also the energy circulation from the navel to 4 extremities.
Such a "side structure" of the body can be represented by 4 additional energy centers, connected with the navel. So, the Navel center corresponds to 4 sefirot of different qualities.
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