👉 Nidsea is a biblical term, referring to the Sea of Galilee. Rau is a Hebrew term meaning "lake." The sea of Galilee is a lake in the region between two mountains, Mount Sina and Mount Pala, that is often called by Christians the "nir" or "nidsea," meaning "the water of the lake." Definition: Nidsea of Palestine, a lake in the region of Gilead between Mount Sinai and Mount Pala. It is believed to have been formed by a catastrophic event where the waters of the Dead Sea eroded into the sea. The name derives from the ancient Israelite tradition that this was the source of the water which nourished the local tribes after they left Egypt and settled in the land. Nidsea of Palestine is considered one of the seven great lakes (the others being the Danube, Euphrates, Caspian, Black, and Jordan) by the Bible scholars.