Valmiki Ramayana Ayodhya Kanda Sarga 84 Shloka 2
Original Shlokaमहतीयमितस्सेना सागराभा प्रदृश्यते। नास्यान्तमधिगच्छामि मनसापि विचिन्तयन्।।2.84.2।।
1 source checked for this shloka
इतः this side, सागराभा looking like an ocean, इयम् this, महती vast, सेना army, प्रदृश्यते appearing, मनसा in my mind, विचिन्तयन्नपि even by thinking, अस्याः this army's, अन्तम् end, नाधिगच्छामि I am not able to reach.
Here is an army as vast as the ocean, and I am unable to comprehend its magnitude even mentally.