# whose home I have made ... in the salt land?
"I am the one who has untied ... whose home I have made in the Arabah, his house in the salt land.". The question that began with the words "Who has untied" in verse 5 ends here.
# whose home I have made in the Arabah
"I gave him the Arabah as a place to live". Yahweh describes the donkey as though he were a person that had a house.
# the salt land
the land around the Salt Sea that has a lot of salt in it