Ramayana
पुरा त्रेतायुगे राम बभूव बहुविस्तरम् । समन्ताद्योजनशतं विमृगं पक्षिवर्जितम् ॥ 7-77-1 ॥
Long ago in the Treta age, O Rama, there came to be a vast forest, extending a hundred yojanas on every side, devoid of beasts and empty of birds.
english translation