The Hebrew word nahar (נָהָר) as a noun means river or stream, and as a verb means to flow or to shine/be radiant. It appears about 119 times in the OT. The four rivers of Eden (Genesis 2:10–14) are called neharim.
Rivers in the Bible carry profound theological weight. The nahar of Eden (Genesis 2:10) flowed from the garden to water the whole earth — a picture of life flowing from God's presence. The great rivers — Euphrates, Tigris, Nile — marked covenant geography. Isaiah 48:18 declares: 'If only you had paid attention to my commands, your peace would have been like a river' — shalom as an overflowing nahar. Ezekiel's vision of the river flowing from the temple (Ezekiel 47) is one of Scripture's most powerful eschatological images — wherever the river flows, everything lives. This finds its ultimate fulfillment in Revelation 22:1–2: the river of the water of life, flowing from the throne of God and of the Lamb.