Boonies and Sand dune

Boonies noun - The open rural area outside of big towns and cities.

Sand dune and boonies are semantically related. In some cases you can use "Sand dune" instead a noun "Boonies".

Sand dune noun - A ridge of sand created by the wind; found in deserts or near lakes and oceans.

Boonies and sand dune are semantically related. Sometimes you can use "Boonies" instead a noun phrase "Sand dune".