en_tn_condensed/zep/02/05.md

the inhabitants of the seacoast, the nation of the Kerethites

The first phrase explains where the Kerethites lived.

Canaan, land of the Philistines

The Philistines were one of several people groups who lived in Canaan.

until no inhabitant remains

"until no one is left." This can be stated in positive form. AT: "until every inhabitant is dead"