Navel seat
Seat of samāna-vāyu
The navel seat of samāna-vāyu, the equalising wind of digestion, said to kindle the gastric fire at the centre between prāṇa above and apāna below.
Point 6 of 13 in Prāṇa Vāyus — Five Winds
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Sources
B.K.S. Iyengar, Light on Prāṇāyāma (secondary)