Just as the union of all 𝜌 gradient paths sharing a common terminal nuclear CP specifies a unique volume-the atomic basin-the union of all 𝒫 gradient paths (𝒢) sharing a common terminal maximum specifies a unique area-a maximum basin-corresponding to a unique gradient bundle called a bond wedge. When bond wedges on neighboring atoms share some portion of an interatomic surface, they combine to form a bond bundle. Figure depicts the bond wedges of a C atom in ethylene, delineated by red 𝒢 linking saddle to minimum CPs on the sphere surface, and the corresponding ethylene bond bundle surfaces.