Despite it's Chinese roots, kanji undoubtedly form the foundation of current Japanese language. The Japanese word kanji ($B4A;z(B) literally means Han-characters, meaning supposedly Han dynasty in China.
Kokuji ($B9q;z(B) means literally national characters, they are characters originating from Japan. Wasei kanji ($BOB@=4A;z(B) literally "Chinese characters made in Japan" means the same. There are hundreds of these.
Some of kokuji are introduced here:
$BF=(B ($B$H$&$2(B (tge) mountain pass)
$B:g(B ($B$5$+$-(B (sakaki) sakaki tree, genus Cleyera)
$BH*(B ($B$O$?$1(B (hatake) field of crops)
$BDT(B ($B$D$8(B (tsuji) crossroads, street)
$BF/(B ($B$I$&(B (d), hatara(ku) work)
$BA#(B ($B$;$s(B (sen), gland)
Have you ever been to Hakone?
This is one of the towns we recommend.
Some of them like "$BA#(B" have been introduced to China.