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The extent of the continuous zone of chaotic orbits of a small-mass tertiaryaround a system of two gravitationally bound primaries (a double star, a doubleblack hole, a binary asteroid, etc.) is estimated analytically, in function ofthe tertiary's orbital eccentricity. The separatrix map theory is used todemonstrate that the central continuous chaos zone emerges (above a thresholdin the primaries mass ratio) due to overlapping of the orbital resonancescorresponding to the integer ratios p:1 between the tertiary and the centralbinary periods. In this zone, the unlimited chaotic orbital diffusion of thetertiary takes place, up to its ejection from the system. The primaries massratio, above which such a chaotic zone is universally present at all initialeccentricities of the tertiary, is estimated. The diversity of the observedorbital configurations of biplanetary and circumbinary exosystems is shown tobe in accord with the existence of the primaries mass parameter threshold.

Chaotic zones around gravitating binaries