Selkup is fractured in an extensive dialect continuum whose ends are no longer mutually intelligible. The three main varieties are the Taz (Northern) dialect (тазовский диалект, tazovsky dialekt), which became the basis of the Selkup written language in the 1930s, Tym (Central) dialect (тымский диалект, tymsky dialekt), and Ket dialect (кетский диалект, ketsky dialekt). It is not related to the Ket language.