You can omit the word "to", but only if you also omit the word "the". The sentence would read: "Japan is east of China." It means the same thing as "Japan is to the east of China."

You can say "Japan is east of China" in order not to use "to". Happy learning! :)

Or you could also say, Japan is situated in the Eastern part of China.☺️

No, you need the word “to.” If I say “Japan is the east of China,” that means EVERYTHING to the east of China is Japan. By putting “to,” you’re saying that that’s only one of the places to the East. Hope that helps!

Japan is east of China