This paper presents a phase description of chaotic dynamics for the study of chaotic phase synchronization. A prominent feature of the proposed description is that it systematically incorporates the dynamics of the non-phase variables inherent in the system. Taking these non-phase dynamics into account is essential for capturing the complicated nature of chaotic phase synchronization, even in a qualitative manner. We numerically verified the validity of the proposed description for the R{o}ssler and Lorenz oscillators, and found that our method provides an accurate description of the characteristic distorted shapes of the synchronization regions of their chaotic oscillators. Furthermore, the proposed description allowed us to systematically explain the origin of this distortion.
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