Continental drip

Continental drip is the observation that southward-pointing landforms are more numerous and prominent than northward-pointing landforms. For example, Africa, South America, India etc. all taper off to a point towards the south. The name is a play on "continental drift".
The observation was made by Ormonde de Kay in a 1973 tongue-in-cheek paper. John C. Holden expanded and illustrated his own version of the idea in 1976.
The planet simulator (software toy) "SimEarth" by Maxis includes continental drip in its Terran (Earth) simulations.