Valmiki Ramayana Kishkindha Kanda Sarga 30 Shloka 23

नृपात्मज prince, स्निग्धगम्भीरनिर्घोषाः with pleasing deep sound, शैलद्रुमपुरोगमाः wandering over trees on the mountains, मेघाः clouds, सलिलम् waters, विसृज्य having showered, परिश्रान्ताः exhausted.

'O prince having discharged their water the clouds (after the rains) are exhausted. They are moving now over trees and mountains, making deep and pleasant sounds.