Kassala, with its wonderful setting at the foot of the melting granite peaks of the Taka Mountains, is where half the tribes of northern Sudan seem to meet. Its huge souqs are an ethnic mosaic of colours, smells, noises and experiences. There are famous camel races annually in September or October.
Karima itself is just a dusty Nile-side Nubian village. If it weren't for its extraordinary collection of ancient sites, which together have given the whole area Unesco World Heritage status, there would be little reason to stop here. As it is though, the majesty of Karima's past will probably remain with you for a long time.
Smack in the heart of the country, the beautifully green and (in places) forested Nuba Mountains are, in a sense, a gateway to sub-Saharan Africa. This Scotland-sized slab of fertile land is inhabited by the Nuba people, 60-some related tribes and subtribes with as many differences as similarities.