Landform Clue a naturally raised area of land, not as high or craggy as a mountain http://baytrail.abag.ca.gov/vtour/map4/access/CyteHils/Cyte Hils1.htm Hill a low area of land between hills or mountains, typically with a river or stream flowing through it http://pubs.usgs.gov/of/2004/1216/h/h.html Valley a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill http://www.nps.gov/lavo/planyourvisit/hiking_brokeoff_mou ntain.htm Mountain a large area of flat land with few trees http://geomaps.wr.usgs.gov/parks/province/intplain.html Plain a piece of land surrounded by water http://www.nytimes.com/2012/08/22/world/asia/dispute- over-islands-reflect-japanese-fear-of-chinas-rise.html?_r=0 Island a very large expanse of sea, in particular, each of the main areas into which the sea is divided geographically http://www.nasa.gov/jpl/oco2/quikscat-rapidscat- 20140619/#.U-AA3-NdVik Ocean a large natural stream of water flowing in a channel to the sea, a lake, or another such stream http://www.blm.gov/or/districts/roseburg/recreation/wild_a nd_scenic_river/ River a large body of water surrounded by land http://www.nsf.gov/news/news_summ.jsp?cntn_id=119359 Lake a small body of still water formed naturally or by hollowing or embanking http://www.fairfaxcounty.gov/dpwes/watersheds/ponds.htm Pond a dry, barren area of land, especially one covered with sand, that is characteristically desolate, waterless, and without vegetation http://www.oregon.gov/dsl/DO/Pages/map_bend.aspx Desert a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust http://hvo.wr.usgs.gov/volcanowatch/archive/2009/09_07_23.html Volcano an area of relatively level high ground http://www.nature.nps.gov/geology/tour/cplateau.cfm Plateau .