What is the name for Mars's boundary between northern lowlands and southern highlands?

What is the name for Mars’s boundary between northern lowlands and southern highlands? It is the Martian dichotomy. This planet-wide geological contrast separates the low, relatively smooth northern plains from the higher, older, heavily cratered southern highlands.

The dichotomy is visible in several ways: elevation changes, differences in crustal thickness, surface age, crater density, and terrain texture. In places, the transition is a sharp scarp rising kilometers above the lowlands; elsewhere, it is a broad, irregular zone. The boundary is especially important because it records one of Mars’s largest crustal-scale divisions.

Scientists still debate how the dichotomy formed. Proposed explanations include a colossal impact in the northern hemisphere, multiple impacts, mantle convection, and large-scale crustal thinning. No single origin model has won universal acceptance. “Dichotomy boundary” is also a common descriptive label, but “Martian dichotomy” is the standard name for the underlying hemispheric division. The feature should not be confused with Earth’s Wallace Line or with a single sharply defined geological fault.