Joshua, and all Israel with him, took Achan the son of Zerah, and the silver, and the mantle, and the wedge of gold, and his sons, and his daughters, and his oxen, and his donkeys, and his sheep, and his tent, and all that he had: and they brought them up to the valley of Achor.
The heap of stones the people raised over Achan, his family, and his possessions (Joshua 7:26) memorialized this act of rebellion for the Israelites and their children (cf. Joshua 8:29; 2 Samuel 18:17). They named the valley in which the execution took place "Achor" (lit. troubling or disaster) as a further reminder (cf. Hosea 2:15; Isaiah 65:10). Note the wordplay with Achan’s name.