The present site of the town was the location of theAinu settlementZiancha until 1884, when the Russian village ofGalkino-Vraskoye (named afterMikhail Galkin-Vraskoy) was founded.[citation needed] TheTreaty of Portsmouth saw it transferred to Japanese control in 1905, along with the rest of southern Sakhalin. It was givenmachi (town) status by the Japanese, under the nameOchiai (Japanese:落合町,Hepburn:Ochiai-machi).
TheRed Army retook control of the whole of Sakhalin in 1945, during the closing stages ofWorld War II. In 1946, the town received its present name, roughly translating astown in the valley.
Since the 1940s, the town's population has decreased by more than half, from a high of 25,135 in 1941 down to 12,200 inhabitants recorded in the 2010 Census.
Like the rest of southern Sakhalin, Dolinsk has a coldhumid continental climate (KöppenDfb) with cold and snowy winters and mild, rainy summers. Lying exposed to moist southeasterly flows from the Pacific Ocean, it is substantially wetter than either Yuzhno-Sakhalinsk or Alexandrovsk-Sakhalinsky, and receives very heavy snow in winter.
Сахалинская областная Дума. Закон №25-ЗО от 23 марта 2011 г. «Об административно-территориальном устройстве Сахалинской области», в ред. Закона №62-ЗО от 27 июня 2013 г. «О внесении изменения в статью 10 Закона Сахалинской области "Об административно-территориальном устройстве Сахалинской области"». Вступил в силу 9 апреля 2011 г.. Опубликован: "Губернские ведомости", №55(3742), 29 марта 2011 г. (Sakhalin Oblast Duma. Law #25-ZO of March 23, 2011On the Administrative-Territorial Structure of Sakhalin Oblast, as amended by the Law #62-ZO of June 27, 2013On Amending Article 10 of the Law of Sakhalin Oblast "On the Administrative-Territorial Structure of Sakhalin Oblast". Effective as of April 9, 2011.).
Сахалинская областная Дума. Закон №524 от 21 июля 2004 г. «О границах и статусе муниципальных образований в Сахалинской области», в ред. Закона №45-ЗО от 27 мая 2013 г. «О внесении изменения в Закон Сахалинской области "О границах и статусе муниципальных образований в Сахалинской области"». Вступил в силу 1 января 2005 г. Опубликован: "Губернские ведомости", №175–176(2111–2112), 31 июля 2004 г. (Sakhalin Oblast Duma. Law #524 of July 21, 2004On the Borders and Status of the Municipal Formations in Sakhalin Oblast, as amended by the Law #45-ZO of May 27, 2013On Amending the Law of Sakhalin Oblast "On the Borders and Status of the Municipal Formations in Sakhalin Oblast". Effective as of January 1, 2005.).