Karoo (crater) Karoo (crater) Karoo is an impact crater on the Asteroid 253 Mathilde, named for the Great Karoo Basin, a coal basin in South Africa. It is 33.4 kilometers in diameter and was the most prominent crater seen during NEAR Shoemaker's Flyby of the Asteroid. The critical crater diameter is the scale at which cratering “goes global” and results in a solitary distinct crater. All smaller craters—however large D might be—are local events. Mathilde is thus a particularly interesting case, since it is the largest asteroid imaged at sufficient resolution to show that its topography is clearly exogenic, governed by impacts.
Physical geography of the Basque Country Physical geography of the Basque Country The physical geography of Euskal Herria is very diverse despite the small size of the region. The territory hosts a blend of green and brown to yellowish tones, featuring hilly terrain altogether. The Basque Country spreads from the rough coastal landscape to the semi-desert of the Bardenas on the south-eastern fringes of Navarre. The main natural limits of the Basque Country are the Cantabrian Sea (south Bay of Biscay) in the north and in the west side, and in the south side, the Ebro river. The highest point in the Basque Country is the