Natyashastra
नगरे वा वने वापि सागरे पर्वतेऽपि वा । दिव्यानां गमनं कार्यं द्वीपे वर्षेषु वा पुनः ॥ १८॥
Whether in a city, a forest, the ocean, or a mountain, the movement of the divine beings should be depicted on an island or during the rainy season as well.
english translation
nagare vA vane vApi sAgare parvate'pi vA । divyAnAM gamanaM kAryaM dvIpe varSeSu vA punaH ॥ 18॥
hk transliteration by Sanscript