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whaeer is the asthenosphere located

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The asthenosphere is the weak, ductile part of the upper mantle that lies directly beneath the rigid lithosphere (the crust plus the uppermost mantle). It typically begins tens to a few hundred kilometers below Earth’s surface (roughly 50–200 km, thinner beneath mid‑ocean ridges and oceanic lithosphere, thicker under continents) and continues to several hundred kilometers depth (its lower boundary is not sharp but is often placed below a few hundred km and sometimes near the mantle transition zone around 410–660 km). It’s characterized by lower seismic velocities and partial melt that allow the overlying tectonic plates to move.