One of the main controversies regarding the phonology of geminates is whether geminates are best represented as being underlyingly moraic or as being a single consonant linked to two C-slots. One language that has played a major role in the discussion of geminate representation is the Micronesian language Chuukese, also known as Trukese. After reviewing the arguments for the moraic representation of Chuukese geminates, this chapter develops a comprehensive optimality-theoretic analysis of Chuukese quantity-manipulating phonology that includes an analysis of initial geminates, final mora deletion, syllable weight, the minimal word effect, compensatory lengthening, geminate throwback, and cases of variation.