# Aroer

This is the name of a city. See how you translated this in Deuteronomy 2:36.

# the Valley of the Arnon

This is the name of a place. See how you translated this in Deuteronomy 2:24.

# Mount Siyon ... Mount Hermon

These are different names for the same mountain. 

# Mount Siyon

The word "Siyon" is another spelling of "Sirion" Deuteronomy 3:9. 

# Mount Hermon

See how you translated this in Deuteronomy 3:8.