"Well" would be a term for an area with a high amount of liquid vis, which is mostly a replenishing source. "Nexus" would be another. AM normally just calls them Magic Aura.
Good question, that bothered me a bit as well in the campaign (we just call everything vis though, with some issues).
Vestige comes from Latin "vestigium" (plural: vestigia) and either sounds like a good option although I believe it's usually meant more as trace, imprint, footprint or an instant moment of time.
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