तस्य समन्ततो मण्डलीभूता भूम्यनन्तरा अरिप्रकृतिः ॥ कZ_०६.२.१४ ॥
tasya samantato maṇḍalībhūtā bhūmyanantarā ariprakṛtiḥ
Around him, forming a circle (maṇḍala), the immediately adjacent territory constitutes the enemy-element (ari-prakṛti).
Contiguity creates structural competition over borders, resources, and influence; Kauṭilya models this as a recurring geopolitical tendency.
Analytical: it is a predictive rule for strategic planning, not a statement that neighbors must always be fought.