Spoiler Final suggestions (East Asia) : Siberian Jade mines -Added opium to Burma and Laos Burma has always been a huge producer of opium absolutely needs a source of it here. Laotian northern highlands also are home to many opium fields. -Made Laotian highlands tile a savanna The highlands are not as wet as the coast. -Added rubies north of the jade in Burma The Mogok Valley was the worldwide source of rubies for hundreds of years, they ought to have one available for trade. -Changed two tiles in southern Sakhalin to moorland Allows settlement. -Seconding stormogulen's proposals for this region Obsidian deposits, I believe there were others. -Added coal to Sakhalin Mined since Russian occupation. -Rare earths in the north east Meant to encourage settlement as this corner often never gets a city in most games. -Added rare earths to Taiwan Reflects industrial growth in the modern era. -Replaced South China fish with shrimp China should get at least one source of shrimp. -Replaced plains with grassland in Japan and Korea Is there any reason for the plains tiles in Korea or Japan? I couldn't find anything suggesting these areas were largely drier. -Replaced highlighted fish with shrimp Obviously Japan needs shrimp, I think there actually should be a second source as well, just not sure where the best place for it is. -Extended bamboo forests in lower Honshu Wakayama especially needs a forest. -Made Mt. Fuji moorland Barely noticeable, makes it stand out a bit.