Tomarinsky District () is an administrative district (raion) of Sakhalin Oblast, Russia; one of the seventeen in the oblast.Law #25-ZO Municipally, it is incorporated as Tomarinsky Urban Okrug.Law #524 It is located in the southwest of the Island of Sakhalin. The area of the district is . Its administrative center is the town of Tomari. Population: The population of Tomari accounts for 48.0% of the district's total population.

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