"longitudinal dune." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/longitudinal-dune>.
longitudinal dune. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/longitudinal-dune
A large, elongated dune lying parallel to the prevailing wind direction. Longitudinal dunes usually have symmetrical cross sections. They generally form in areas that are located behind an obstacle where sand is abundant and the wind is constant and strong. They are usually tens of meters high and up to 100 km (62 mi) long.