en_tn_condensed/jer/04/15.md

a voice is bringing news from Dan

Here "a voice" represents a messenger. Alternate translation: "a messenger comes and tells about what is happening in Dan" (See: rc://en/ta/man/translate/figs-synecdoche)

Dan

This probably refers to the region of Dan, which was west of Jerusalem.

the coming disaster is heard from the mountains of Ephraim

This can be stated in active form. Alternate translation: "people hear about the disaster that is coming from Ephraim" (See: rc://en/ta/man/translate/figs-activepassive)

from Dan ... mountains of Ephraim

By hearing that the enemies had gotten to Dan and Ephraim, people in Jerusalem would understand that the enemies were getting closer to them.