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We consider the conditions necessary for obtaining perturbative maximalsupergravity in d dimensions as a decoupling limit of type II superstringtheory compactified on a (10 -- d)-torus. For dimensions d = 2 and d = 3 it ispossible to define a limit in which the only finite-mass states are the 256massless states of maximal supergravity. However, in dimensions d > 3 there areinfinite towers of additional massless and finite-mass states. These correspondto Kaluza--Klein charges, wound strings, Kaluza--Klein monopoles or braneswrapping around cycles of the toroidal extra dimensions. We conclude thatperturbative supergravity cannot be decoupled from string theory in dimensionsd > 3. In particular, we conjecture that pure N = 8 supergravity in fourdimensions is in the Swampland.

Decoupling Supergravity from the Superstring