Riparian zone

thumb|Components of an artificial levee: thumb|The side of a levee in Sacramento, California|Sacramento, [[California]]

thumb|Aerial view of Flevopolder, the [[Netherlands]] alt=|thumb|Satellite imagery|Satellite image of [[Noordoostpolder, the Netherlands (595.41 km2)]] A polder () is a low-lying tract of land that forms an artificial hydrological entity, enclosed by embankments known as dikes. The three types of polder are:

flooded parcel of arable land used for growing semiaquatic rice

channel bottom of a stream, river, or creek

process of creating new land from oceans, riverbeds, or lakes

in geography, area between high and low tide marks of water bodies (both still and moving), or a raised landform on the side of a water body

landform

type of riparian forest in dry regions

forested or wooded area of land adjacent to a body of water

interface between land and a river or stream

step-like landform

thumb|right|Flood-meadow near Hohenau an der March thumb|right|The same meadow in spring

deliberate human modification of the course, flow, or other characteristics of a river

thumb|upright=1.2|Tugai vegetation along the Syr-Darya in [[Kazakhstan, Central Asia.]]

type of aquatic ecosystem with flowing freshwater

theory and measures to control erosion

The maximum water level of a bank or shore

thumb|upright=1.2|right|Asphalt and sandbag revetment with a geotextile filter

Land use and runoff management technique

Property rights adjacent to waterways

work to improve the environmental health of a river or stream

area of flat land on a slope

soil type

conditional descriptions of a plain based on elevation above sea level

Largely undeveloped or wild land, usually forested, surrounding a river or stream