Bridge over marshland near the Khongoryn Els sand dunes in the Gobi Desert, Mongolia

© Franck Guiziou/Hemis/Corbis - 2014-03-29

natural landscape nature natural environment grass grassland vegetation nature reserve boardwalk ecoregion prairie horizon walkway tree plain landscape plant community tundra steppe plant rural area hill national park meadow wood path bog forest nonbuilding structure wetland road marsh wildflower