Strong’s Hebrew
H7406 — rekec
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
רֶכֶס
rekec — pronounced reh'-kes
from 7405; a mountain ridge (as of tied summits):--rough place. see H07405
1 occurrence in the KJV.
Isaiah 40:4
Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain: