Garudapurana 1.48.15

1.48.15

yāmyāṃ vai kṛṣṇarūpā tu nairṛtyā śyāmalā (dhūsarā) bhavet /
vāruṇyāṃ pāṇḍurā jñeyā vāyavyāṃ pītavarṇikā //

in the south, black; in the southwest, grey; / in the west, it should be known as pale; in the northwest, yellow-colored;