The battlefield presents a massive physical and strategic obstacle, shaped by a harsh and complex landscape. Two steep rock formations rise sharply on either side of a valley, forming a narrow and treacherous pass that Jonathan must navigate to reach the enemy camp. The primary approach among commentators is that these towering cliffs stand firmly positioned in place [מצודת ציון, מצודת דוד, רד״ק, ביאור שטיינזלץ]. However, they are also understood as sloped, rising structures [רש״י], or even as high observation points overlooking the area [רד״ק].
These two cliffs face directly opposite each other [מצודת ציון]. The first rock stands to the north, facing Michmash, looking directly toward the Philistine camp [רד״ק, מצודת דוד, אלשיך]. The second rock stands to the south, facing Geba, which is the site of the Israelite camp and the starting point of Jonathan's mission [רש״י, רד״ק]. To reach his destination, Jonathan is forced to cross directly through the space between these two imposing cliffs [רד״ק].
Beyond the basic geography, the physical shape of the rocks creates an unprecedented tactical challenge. The southern cliff near Geba is completely smooth and steep on its northern face, making a safe descent nearly impossible. Conversely, the northern cliff near Michmash is entirely smooth and steep on its southern face, making the ascent appear unachievable. Because of the sheer, slippery slope of the Michmash cliff, Jonathan has to painstakingly climb it using both his hands and his feet [אלשיך].
This extreme terrain dramatically multiplies the danger of the mission. Jonathan and his companion are already at a severe numerical disadvantage, as just two men advancing against a massive enemy camp. Added to this, they must conquer a landscape that makes simply reaching their target seem almost entirely impossible [מלבי״ם].