दक्षिणस्य समुद्रस्य तथा विन्ध्यस्य चान्तरे । ये देशास्तेषु युञ्जीत दाक्षिणात्यां तु नित्यशः ॥ ४०॥
Those regions between the Southern Sea and the Vindhya Mountains should be included in the Southern part, which is to be used constantly.
english translation