Jeremiah 3:12-13
Jeremiah, pleading for Israel to repent, to "acknowledge your iniquity" (verse 13), asks that his words be proclaimed "toward the north." Jeremiah, remember, lived at the time of Judah's fall to the Babylonians, some 130 years after the Kingdom of Israel had been forcibly moved out of its homeland. So, he was not writing to Israelites domiciled within a hundred miles north of Jerusalem—residing in and around Samaria. No, he is addressing a people living somewhere else further north.
Charles Whitaker
Searching for Israel (Part Eight): The Scattering of Ten-Tribed Israel

Pleading for Israel to repent and acknowledge its iniquity, Jeremiah directs his words toward the north. Living during Judah's fall to the Babylonians—some 130 years after the Kingdom of Israel had been forcibly removed from its homeland—Jeremiah was not addressing Israelites settled within a hundred miles north of Jerusalem in and around Samaria. Instead, he speaks to a people dwelling somewhere farther north.