Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 79

बलवान् powerful, असौ he, कपिकुञ्जरः an elephant among monkeys, वेगेन swiftly, येन मार्गेण the path, याति proceeding, तेन by that, सहसा instantly, अर्णवः the sea, द्रोणीकृतः इव like a valley betwen two mountains.

As the powerful monkey, an elephant among vanaras, was proceeding swiftly along, the ocean got instantly transformed into a trough on account of water swelling by the force of his flight.