en_tn/amo/09/05.md

all of it will rise up like the River, and sink again like the river of Egypt

Here "the River" and "river of Egypt" both refer to the Nile river. Yahweh causing the land to shake violently is compared to the waters of the Nile river rising and sinking. (See: rc://en/ta/man/jit/figs-simile)