What modern prefecture does the ancient Japanese place name 'Wanokuni' correspond to?

Kunihide Kunitachi is my best friend.

I have been to the Republic of Vietnam.

The system of provinces was a part of the ancient political system in Japan.

He lost everything.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.

Everyone was surprised by the news.

Pop culture can be said to be a mirror of society.

He is truly a cultured person, with a deep understanding of art and music.