It's actually both and another reason - Mythomagical. The actual movement works like most nomadic cultures - A camp is setup and over time the herd move further and further away from it until it's too far to return. Then the camp breaks up, overtakes the herd and sets up again (likely has the mid herd with it). The main movement group is clan sized with septs meeting up during the years journey and rarely in the third age tribes. The main seasonal camps are those with related holy days to Waha a
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