## the land of Sinim ##

This probably is a region in the south of Egypt near Aswan. (See: [[rc://en/ta/man/translate/translate-names]])

## Sing, heavens and be joyful, earth; break into singing, you mountains! ##

Isaiah turns his attention from the people of Israel and speaks to the heavens, earth, and mountains as if they were people. (See: [[rc://en/ta/man/translate/figs-apostrophe]])