The Siletz were the southernmost of several divisions of the Tillamook people speaking a distinct dialect; the other dialect-divisions were: Salmon River on the Salmon River, Nestucca on Little Nestucca River, Nestucca River and Nestucca Bay, Tillamook Bay on the Tillamook Bay and the mouths of the Kilchis, Wilson, Trask and Tillamook rivers, and Nehalem on Nehalem River. Wikipedia