Provinces of China
Provincial-level administrative divisions () or first-level administrative divisions (), are the highest-level Chinese administrative divisions. There are 34 such divisions, classified as 23 provinces (), four municipalities, five autonomous regions, and two Special Administrative Regions. All but Taiwan Province and a small fraction of Fujian Province (currently administered by the Republic of China) are controlled by the People's Republic of China.
The Battle of China
The introductory maps shown in the film show "China" as divided into "China Proper" and four outer provinces, namely "Manchuria", "Mongolia", "Sinkiang" (Xinjiang), and "Tibet". The very concept of a "China Proper"—either presently or historically—remains highly debated. The Japanese puppet state in Manchuria is discussed but never treated as actually separate from China. 
The borders of the outer territories follow the claims of the Republic of China, which means "Manchuria" includes some territory now administered by Russia and the film's "Mongolia" is Greater Mongolia, including the Qing and Republican province of Outer Mongolia (now the independent state of Mongolia) and including Tannu Uriankhai, now administered by Russia. Minor borderlands of Afghanistan, Pakistan, and India are also claimed, as well as large areas of the Tajik province of Gorno-Badakhshan, the Indian state of Arunachal Pradesh, and the Burmese state of Kachin.