Etymology and distribution of 澤沼.

Sawanuma 【澤沼】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Ehime-ken Uwajima-shi , Ooita-ken Saiki-shi . Summary . Tell her that the descendant of Mr. Kiyohara called "Heike Kiyohara (Kiyoharake)" in Heian era. 清原 Kiyohara reference. Ehime-ken Uwajima-shi was in the Warring States Period.