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The recently discovered family of AV$_3$Sb$_5$ (A: K, Rb Cs) kagome metalspossess a unique combination of nontrivial band topology, superconductingground states, and signatures of electron correlations manifest via competingcharge density wave order. Little is understood regarding the nature of thecharge density wave (CDW) instability inherent to these compounds and thepotential correlation with the accompanying onset of a large anomalous Hallresponse. To understand the impact of the CDW order on the electronic structurein these systems, we present quantum oscillation measurements on singlecrystals of CsV$_3$Sb$_5$. Our data provides direct evidence that the CDWinvokes a substantial reconstruction of the Fermi surface pockets associatedwith the vanadium orbitals and the kagome lattice framework. In conjunctionwith density functional theory modeling, we are able to identify splitoscillation frequencies originating from reconstructed pockets built fromvanadium orbitals and Dirac-like bands. Complementary diffraction measurementsare further able to demonstrate that the CDW instability has a correlatedphasing between neighboring V$_3$Sb$_5$ planes. These results provide criticalinsights into the underlying CDW instability in AV$_3$Sb$_5$ kagome metals andsupport minimal models of CDW order arising from within the vanadium-basedkagome lattice.

Fermi surface mapping and the nature of charge density wave order in the kagome superconductor CsV$_3$Sb$_5$