This article investigates two different types of geminates, namely, single vowel-adjacent geminates and intervocalic geminatesGeminateintervocalic geminate in Iranian Sistani dialectsistani dialect (henceforth ISD). The analyses of these geminate processes are based on the Optimality theoryOptimality theory (OT). The data have been gathered through fieldwork in Sekooheh (locally known as sækvæ) village in Sistan, which is located in the northern Sistan and Baluchestan province, IranIran. The moraic representation of the syllable structure in this dialectDialect(s) supports the idea that geminate in ISD is underlying moraic. Similarly, the research findings show that both single vowel-adjacent geminates and intervocalic geminatesGeminateintervocalic geminate are common in ISD, whereas no initial geminatesInitial geminate have been observed in the research data. Furthermore, almost all consonantsConsonants can occur as geminate consonantsConsonants in word-final position, while no glide and glottal consonantsConsonants appear as geminate consonantsConsonants in this position. Also, geminate analysis in ISD shows that there is no super-heavy syllableHeavy syllable in this dialectDialect(s) since geminate only occurs after short vowelsVowels.