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Shenzhou (Land of the Divine)
Jiuzhou (Land of Nine Domains)
Jiangshan (Land of Rivers and Mountains)
Sihai (Four Seas)
Dalu (Mainland)
Neidi (Mainland)
Yanwen Zhou has written:
'Riben Jiuzhou da xue wen xue bu shu ku Ming ban du lu'
Some suggestions from the historic written forms:
1:↓↓↓
"The Middle Kingdom"
2:↓↓↓
"Shenzhou (Land of the Divine)
Neidi (Mainland)"
3:↓↓↓
"China is called ZhÅngguó in Mandarin Chinese."