Is it the Permian, Bakken, or Marcellus? Let’s quiz ourselves on production zones.
Permian, by a mile — the frac job count and proppant tons since 2018 dwarf Bakken and Marcellus; see EIA’s Drilling Productivity reports: https://www.eia.gov/petroleum/drilling/. If by “most fracked” you mean per-well intensity, Marcellus laterals can be monsters, but total activity still screams Permian. You counting wells, stages, or sand?