From tsachach; glaring, i.e. Exposed to the bright sun -- higher place, top.
see HEBREW tsachach
H6706. tsachiach
[צָחִיחַ] noun [masculine] shining, glaring, surface construct סֶלַע צְחִיחַ i.e. a smooth, bare, rock Ezekiel 24:7-8, 26:4, 14; plural בַּצְּחִיחִים Nehemiah 4:7 Qr (Kt בַּצְּחִחִיִּים), in glaring, bare places (?).