The present site of the town was the location of the Ainu settlement Ziancha until 1884, when the Russian village of Galkino-Vraskoye (named after Mikhail Galkin-Vraskoy) was founded.[citation needed] The Treaty of Portsmouth saw it transferred to Japanese control in 1905, along with the rest of southern Sakhalin. It was given machi (town) status by the Japanese, under the name Ochiai (Japanese: 落合町, Hepburn: Ochiai-machi).
The Red Army retook control of the whole of Sakhalin in 1945, during the closing stages of World War II. In 1946, the town received its present name, roughly translating as town 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.
The Dolinsk-Sokol air force base is located to the south of the town.
Climate
Like the rest of southern Sakhalin, Dolinsk has a cold humid 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, 2011 On the Administrative-Territorial Structure of Sakhalin Oblast, as amended by the Law #62-ZO of June 27, 2013 On 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, 2004 On the Borders and Status of the Municipal Formations in Sakhalin Oblast, as amended by the Law #45-ZO of May 27, 2013 On Amending the Law of Sakhalin Oblast "On the Borders and Status of the Municipal Formations in Sakhalin Oblast". Effective as of January 1, 2005.).