en_tn/isa/11/09.md

on all my holy mountain

The "holy mountain" is Mount Zion, in Jerusalem. AT: "on all of Yahweh's holy mountain"

the earth will be full of knowledge of Yahweh

The phrase "knowledge of Yahweh" represents people who know Yahweh. AT: "the earth will be full of those who know Yahweh" or "those who know Yahweh will cover the earth" (See: rc://en/ta/man/translate/figs-metonymy)

as the waters cover the sea

This phrase is used to show how full the earth will be of people who know Yahweh. It may be clearer that it does this if its words are similar to the words in the previous phrase. AT: "as the seas are full of water" (See: rc://en/ta/man/translate/figs-simile)