Shilluk is a Western Nilotic language spoken in Southern Sudan. In the study of sound systems, the Western Nilotic languages are of particular interest on account of their rich systems of suprasegmental distinctions. For example, Dinka, another Western Nilotic language, has three levels of vowel length, a voice quality distinction (modal vs. breathy), and – depending on the dialect – three or four distinctive tone patterns (Andersen 1987, Remijsen & Manyang 2009). As we shall see, Shilluk presents a similarly complex system of suprasegmental distinctions.