The Small Divide is an exceptionally long canyon. Two opposing forces were on either side, the order being given to "jump the narrow gap and take out your enemy" at some point.
The map is divided into terraces divided by cliffs without ramps. Air units and transport are needed to claim expansions and take the fight to the enemy.
StarCraft. Vivendi Games. StarCraft maps, The Small Divide (in English), 1998.