There was an about 230 hectare of bottle-gourd-shaped marsh called Naganuma in the land adjacent to Naganuma village, and people in the village had gained the possessory right of the marsh by paying nengu (annual tribute, land tax) to the bakufu (Japanese feudal government headed by a shogun) from Edo period, and most of the people in the village earned their living by fishery.
長沼村に隣接する地に、長沼というひょうたん型をした230町歩程の沼が存在し、江戸時代から、長沼村の村民が幕府に年貢を納めることで沼の占有権を得ており、村の大半の村民が漁業で生計を立てていた。