en_tn_lite_do_not_use/jer/46/18.md

declares the King

Here "King" refers to Yahweh. This can be stated in first person. Alternate translation: "this is what I, the King, declare" (See: rc://en/ta/man/jit/figs-123person)

someone will come like Mount Tabor and Mount Carmel by the sea

This refers to the nation of Babylon who will be as overwhelming to the nation of Egypt as the these two mountains are to the plains that surround them. (See: rc://en/ta/man/jit/figs-simile)

Mount Tabor

This is the name of a mountain in the northern part of Israel. (See: rc://en/ta/man/jit/translate-names)