Driven by the spirit of God to fight in His name, Jonathan embarks on a daring and dangerous solo mission to attack the enemy camp [מלבי״ם]. To reach his target, he must navigate a harsh and complex landscape that physically separates the two armies. The detailed geography highlights the severe danger of the journey. It explains why he will soon have to climb on his hands and feet, and it sets the stage for the ultimate test of faith he will present to himself while facing the enemy [אברבנאל, אלשיך].
The primary approach among commentators is that the crossing point is a valley situated directly between the two camps. The Philistines are stationed on the mountain in Michmash, while the Israelites are camped opposite them in Geba. This valley serves as the path Jonathan takes to move from the Israelite side toward the Philistine position [רש״י, מצודת דוד, מצודת ציון], which is likely situated on higher ground [ביאור שטיינזלץ].
Bordering this narrow passage are two massive, sharp rocks jutting out like teeth on either side of the valley. One rock stands on the side of Geba, and the other on the side of Michmash, creating a tight and difficult pass [רש״י, מצודת דוד, מצודת ציון, מלבי״ם, ביאור שטיינזלץ]. Because of their great height and commanding presence in the landscape, these rock formations are known by specific names: Botzez and Seneh [מלבי״ם]. Although the exact original meanings of these names are not known for certain, traditional translations reveal their distinct physical traits. Botzez refers to a slippery, steep surface that is incredibly difficult to climb, whereas Seneh indicates a flatter, more comfortable, and well-trodden area [רד״ק, אלשיך].
The stark description of this terrain makes it clear that Jonathan does not choose a safe route or seek any tactical advantage. Instead, he leaves himself completely exposed to the enemy, reinforcing the reality that he enters this battle without any military support [אלשיך].