What are the abominations that were done by the nations of Canaan?
Ezra 9:11 (ESV)
11which you commanded by your servants the prophets, saying, ‘The land that you are entering, to take possession of it,is a land impure with the impurity of the peoples of the lands, with their abominations that have filled it from end to end with their uncleanness.
Some of the abominations that the pagan nations were especially known for were sexual immorality (see Leviticus 18:1–30) and child sacrifice (see Psalm 106:34–39).
11 which you commanded by your servants the prophets, saying, ‘The land that you are entering, to take possession of it, is a land impure with the impurity of the peoples of the lands, with their abominations that have filled it from end to end with their uncleanness.