Valmiki Ramayana Kishkindha Kanda Sarga 28 Shloka 22

सलिलातिभारम् heavy loads of water, समुद्वहन्तः while carrying, बलाकिनः accompanied by cranes, वारिधराः clouds, नदन्तः while thundering, महीधराणाम् of mountains, महत्सु on the high, शृङ्गेषु on peaks, विश्रम्य after resting, विश्रम्य halting again, पुनः again, प्रयान्ति move.

'The huge rumbling clouds on the high mountain peaks carry heavy load of water. Now they rest and now resume their journey accompanied by herons.