A scouting report that appears to be a simple geographical survey can sometimes serve as calculated psychological warfare. The spies returning from Canaan presented a detailed map of the local nations, but their true goal was to break the spirit of the Israelites. The primary approach among commentators is that the spies volunteered this specific information without Moses asking for it. Their intention was to prove that entering the land was impossible because enemy forces blocked every conceivable path [ביאור יש״ר, חזקוני].
They described a strategic chokehold around the land. If the Israelites tried to enter through the south, which was the planned route [שטיינזלץ], they would face Amalek. If they pushed north toward the mountains, they would meet the Hittites, Jebusites, and Amorites. If they attempted to flank from the east or west, they would run into the Canaanites [רמב״ן, הטור הארוך, מלבי״ם]. The decision to mention Amalek first is particularly striking. Amalek was not one of the seven Canaanite nations the Israelites were commanded to conquer, nor did they live in the mountainous region the spies were targeting [גור אריה, משכיל לדוד, שפתי חכמים]. However, the spies used the name of this nation to trigger immediate terror. The Israelites had recently suffered a surprise attack by Amalek after leaving Egypt, and bringing them up first was a deliberate move to awaken past trauma and spark the fear of another ambush [רש״י, רש ר הירש].
Regarding the other nations, the spies noted that the Canaanites lived by the sea. As a naturally fierce nation of merchants, they logically settled along the major waterways [העמק דבר]. The spies also emphasized that these Canaanites were stationed right next to the Jordan River. This was a direct and threatening hint that the Israelites would not even be able to cross the river to begin their entry into the land [רש״י].
Ultimately, while the spies answered Moses' questions about the regional geography, they completely ignored his request to find out whether the local population was small or large. They omitted any positive details about the land. By presenting this carefully curated data to the entire camp, they delivered a hidden message: the land was surrounded by invincible warriors. The Israelites instantly understood this threatening implication, which quickly sparked despair and complaints throughout the camp [רמב״ן, הטור הארוך, מלבי״ם].