The bog

A bog is a wet land, but this wetland is a very deceptive place. Although it can look (and sometimes feel) like land (perhaps with some small ponds or pools of water dotting the land, as well); in fact, it is more like a spongy "floating carpet" of land. Underneath the surface, the bog is full of water--about 90-95% water. Bogs are primarily composed of water and peat (which is decaying plants)

http://www.jamesmdeem.com/books.bog.science.html