Topographical map of central and Northern regions of Israel. The Jezreel Valley separates the Northern Galilee region from the Central mountains range. The Jordan river connects the Sea of Galilee to the Dead Sea. Altitude numbers shown are in meters. The lowest point on earth is the surface of the Dead Sea (in Hebrew: "Salt Sea") that is about 400 m below sea level.
Also see Mark Langfan's website for the 3D Topographic Map System of Israel.