dune 
/ˈdu:n, Brit ˈdju:n/ noun
plural dunes /ˈdu:n, Brit ˈdju:n/ noun [count] : a hill of sand near an ocean or in a desert that is formed by the wind
▪ We wandered over the dunes. —called also sand dune; — see color picture
▪ We wandered over the dunes. —called also sand dune; — see color picture
