South west Omo is the Home of Surma a group of some 25,000 Nilotic speakers best known for the lip plates. The varies Surma subgroups (chai, Tirma and Zelmamo) all participate in a rigid but egalitarian political system based around age-sets similar to those of the related Maasai of the Kenya-Tanzanian border area. The unique form of stick fighting called Donga is the very essence of surma. It held in the open fields among two or more group of youngs of each villages to assert their braveness to the society. It is after crossing the Baro River that the traveler first begins to encounter in any numbers the Nilotic people of Ethiopia mainly the Anuwak and Nuer whose curions round houses with low doorways and many tiered that cheed roofs dot the sandy plains below.