All four wetlands (Upo, Mokpo, Sajipo, and Jjokjibeol) are about a meter in depth and surrounded by an embankment. Seasonally, some parts of the wetland floors are exposed, revealing the variety of ecological conditions favorable to plants like willow colony, reed, great duckweed, and Canada parrot feather. Numerous flowers blossom in spring and the area becomes greener with yellow water snowflake, water chestnut, and pickerelweed floating on the water during summer. In August and September, the rare thorn lotus wrapped in thorns blossom their purple flowers and the reeds swaying in the wind create a picturesque scene. When the wind blows colder in winter, water plants sink under the water and go into hibernation until spring. This is the time for migratory birds to pick their fruits and stems.