Ephraim_and_Judah
In the Hebrew Scriptures (Tanakh), the reference of "Ephraim and Judah" (when employed together) are merely figurative terms used for the two ancient Kingdoms of Israel. See History of Ancient Israel and Judah.
The reference of "Ephraim and Judah" is employed most frequently by the Prophets (Nevi'im) of the Hebrew Scriptures. The phrases "Israel and Judah" and "Joseph and Judah" Zechariah 10:6 are used in similar fashion, referencing the same two respective Israelite Kingdoms.