As the Israelites advance northward, they cross natural borders, descending from the mountains of the Transjordan into the lower valleys [ביאור שטיינזלץ]. Leaving their previous encampment at Iye Abarim [דעת זקנים, בכור שור, חזקוני], they bypass eastern Moab and begin a deliberate shift in direction [העמק דבר]. This particular movement was unique, as it was initiated independently by the people themselves rather than being guided by the divine Clouds of Glory. Following the death of Aaron and the subsequent departure of those protective clouds, the nation was forced to advance on its own strength, making independent decisions about their immediate destinations [אור החיים].
Their travels bring them to the Zered Valley, a location whose name reflects both the rushing water descending from the high mountains and the deep, sunken gorge through which it flows [רש ר הירש]. The specific name of the valley points to the thick growth of grasses and twigs lining the riverbed [מלבי״ם]. The historical record of this journey presents an interesting contrast with other accounts of their travels, which list their next stop as Dibon Gad. The primary approach among commentators resolves this by explaining that these are actually two names for the exact same location. The area was simply renamed Dibon Gad much later, after the Israelites conquered the territory and it was given to the tribe of Gad [ביאור יש״ר, אבן עזרא, מלבי״ם]. Alternatively, the different names reflect two distinct lists with different purposes. While other accounts record land-based cities and encampments, this specific record highlights the rivers the nation crossed. Emphasizing these bodies of water serves as an essential introduction to the story of the miraculous well that soon follows [דעת זקנים, בכור שור, חזקוני].
Beyond its geography, this encampment serves as a major historical milestone. Here, God instructs Moses that despite their close proximity to the land of Ammon, the Israelites are strictly forbidden from conquering it, as it is not part of their divine inheritance. Furthermore, they are not even permitted to frighten or loot the Ammonites, a restriction stricter than the one placed upon them regarding Moab. This special protection is granted for two reasons. First, the future wife of King Solomon is destined to descend from the Ammonite line. Second, the Ammonites are rewarded for the exceptional modesty of their ancient matriarch, a striking contrast to the matriarch of Moab, which positively influenced the moral character of her descendants. Instead of engaging Ammon, the Israelites are commanded to redirect their military strength to fight the Amorites and conquer their territory [חומש קה״ת].