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Reason: The map is in direct conflict with File:Qing Empire circa 1820 EN.svg concerning Sakhalin. What is sourceable that shows Sakhalin and the east coast of Taiwan were subject to Qing Manchu rule in the year 1820? Answer: that Qing Empire circa 1820 EN map is poorly made and didn't show Ladakh before Dogra-Tibetan war as Tibetan territory. The Sakhalin Island (ᠰᠠᡥᠠᠯᡳᠶᠠᠨ ᡠᠯᠠ ᠠᠩᡤᠠ ᡥᠠᡩᠠ) was drawn on 18th century's Manchu maps. Wei Yuan (1794-1857)'s Sheng Wu Ji (聖武記) documented "太祖遣兵四百收瀕海散各部,其島居負險者刳小舟二百往取,庫頁內附,歲貢貂皮,設姓長、鄉長子弟以統之。" Page 461 of "Translation of Old Manchu documents of w:en:yamen of Sanxing Fu-dutong" (三姓副都统衙门满文档案) documented that the Nivkhs (費雅喀人) on the island was ruled by Qing "居住海島之庫頁費雅喀人貢貂,則由三姓副都統衙門派出官兵,前往約定之奇集噶珊收集貢貂並頒賞烏林。如不前來約定之地,則令官兵尋入海島,喚起前來,徵收貂皮並頒賞烏林。" By 1820 there was no evidence showing Qing has ceded those territories to any other states. For Taiwan please refer to English Wikipedia article Taiwan under Qing rule and check its references. I'm not here to explain you common knowledges..
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English: Map of the Qing Dynasty in 1820, representing its stablized territory from 1790-1839. (Includes provincial boundaries and the boundaries of modern China for reference.) Provinces in yellow, military governorates and protectorates in light yellow, tributary states in orange. Adapted from File:ROC_PRC_comparison_eng.jpg and information complied from:
Français : Carte du Grand Empire des Qing la 25e année Jiaqing du règne de l'empereur Qing Jiaqing (1820). Cette carte inclus les frontières provinciales et les frontières de la chine contemporaine pour référence. Les provinces sont en jaune, les gouvernorats et protectorats militaires en jaune claire, les états tributaires en orange.
rv to NPOVify: the status on certain outlier islands (e.g. Sakhalin) is not explicitly defined, c.f. the map [http://go-passport.grolier.com/map?id=mh00032&pid=go]