ESV: which are dark with ice, and where the snow hides itself.
NIV: when darkened by thawing ice and swollen with melting snow,
NASB: Which are darkened because of ice, And into which the snow melts.
CSB: and become darkened because of ice, and the snow melts into them.
NLT: when it is swollen with ice and melting snow.
KJV: Which are blackish by reason of the ice, and wherein the snow is hid:
NKJV: Which are dark because of the ice, And into which the snow vanishes.