Canto 2 -
Ayodhyā-kāṇḍa
Chapter 55: Rāma Leaves Bharadvāja’s Āśrama and Crosses the Yamunā
Text 2.55.14

तौ काष्ठसंघाटमथो चक्रतुः सुमहाप्लवम्।
शुष्कैर्वंशैः समास्तीर्णमुशीरैश्च समावृतम्॥

tau kāṣṭha-saṅghāṭam atho cakratuḥ sumahā-plavam
śuṣkair vaṁśaiḥ samāstīrṇam uśīraiś ca samāvṛtam

tau = Rāma and Lakṣmaṇa; kāṣṭha-saṅghāṭam = using wood; atho = then; cakratuḥ = constructed; sumahā-plavam = a very large raft; śuṣkaiḥ = with dry; vaṁśaiḥ = bamboos; samāstīrṇam = it was covered; uśīraiḥ = with the fragrant vīraṇa grass; ca = and; samāvṛtam = completely filled.

Rāma and Lakṣmaṇa then constructed a very large raft using wood. It was covered with dry bamboos and completely filled with the fragrant vīraṇa grass.