Fifteen cubits upward did the waters prevail; and the mountains were covered.
Referenced Verses
Ps 104:6 : 6 Thou coveredst it with the deep as [with] a garment: the waters stood above the mountains.
Jer 3:23 : 23 Truly in vain [is salvation hoped for] from the hills, [and from] the multitude of mountains: truly in the LORD our God [is] the salvation of Israel.