Valmiki Ramayana Aranya Kanda Sarga 53 Shloka 19
Original Shlokaनदीं वैतरणीं घोरां रुधिरौघनिवाहिनीम्।।3.53.19।। असिपत्रवनं चैव भीमं पश्यसि रावण।
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रावण Ravana, रुधिरौघनिवाहिनीम् river carrying torrents of blood flowing, घोराम् dreadful, वैतरणीं नदीम् river Vaitarani, भीमम् frightening, असिपत्रवनं चैव forest of trees with swords as leaves, पश्यसि see.
O Ravana, you see the dreadful river Vaitarani with torrents of blood flowing and frightening forest of trees with swords as leaves.