And since the north, which is the region of gold (and other treasures) stretches between the west and the east therefore is it called the central region.
उत्तरस्य हिरण्यस्य परिवापश्च गालव। मार्गः पश्चिमपूर्वाभ्यां दिग्भ्यां वै मध्यमः स्मृतः॥