Peninsulating is a complex word with a tricky spelling. The word is derived from the noun peninsula, which is spelled as /pɪˈnɪnsjʊlə/ in IPA phonetic transcription. The verb form of peninsula is peninsulate, which means to form a peninsula or to convert into a peninsula. The spelling of peninsulating is formed by adding the suffix -ing to the verb peninsulate. The correct pronunciation for peninsulating is /pəˈnɪnsjʊleɪtɪŋ/. It's important to remember the tricky "s" and "t" combination in the middle of the word while spelling it.