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We investigate groups whose Cayley graphs have poorly connected subgraphs. We prove that a ﬁnitely generated group has bounded separation in the sense of Benjamini–Schramm–Tim´ar if and only if it is virtually free. We then prove a gap theorem for connectivity of ﬁnitely presented groups, and prove that there is no comparable theorem for all ﬁnitely generated groups. Finally, we formulate a connectivity version of the conjecture that every group of type F with no Baumslag-Solitar subgroup is hyperbolic, and prove it for groups with at most quadratic Dehn function.
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