(usually in the plural)Land that is covered mostly with water, with occasional marshy and soggy areas.
2013 January, Nancy Langston, “The Fraught History of a Watery World”, in American Scientist[1], volume 101, number 1, page 59:
European adventurers found themselves within a watery world, a tapestry of streams, channels, wetlands, lakes and lush riparian meadows enriched by floodwaters from the Mississippi River.