Jamieson, Fausset and Brown on Habakkuk 3:10

10. The mountains--repetition with increased emphasis of some of the tremendous phenomena mentioned in Ha 3:6.

overflowing of the water passed by--namely, of the Red Sea; and again, of the Jordan. God marked His favor to His people in all the elements, causing every obstacle, whether mountains or waters, which impeded their progress, to "pass away" [Calvin]. Maurer, not so well, translates, "torrents (rains) of water rush down."

lifted ... hands on high--namely, its billows lifted on high by the tempest. Personification. As men signify by voice or gesture of hand that they will do what they are commanded, so these parts of nature testified their obedience to God's will (Ex 14:22; Jos 3:16; Psa 77:17, 18; 114:4).