Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes.
Hereafter are some analogue images of impressive dunes which were chosen from Flickr's film photos.
|Val d'Orcia Rolling Hills - Autumn edition (Oct 2005) by Michele Berti|
|Where The Pirate Buggies Went by Doha Sam|
|Kumtag desert region of Turpan‖新疆吐鲁番·库木塔格沙漠 by pingshang|
|sand hill by wiiri|
|imperial dunes. glamis, ca. 2000. by eyetwist|
|Monahans Sand Hills -- Evening (b/w #9) by wanderingYew2|
|desert hill by nezmi*|
|Tunnel Hill - Chelan, WA by John Laughlin Photography|
|Untitled by davideee!|
|Đồi cát Nam Cương, Phan Rang 8/2012 by Khánh Hmoong|