The history of the Entre Ríos Nature Trail dates back to an old railway line that connected two towns in the province of Cadiz, El Puerto de Santa María and Sanlúcar de Barrameda, located, respectively, at the estuaries of the rivers Guadalete and Guadalquivir, and which run "between the rivers" (in Spanish, "entre ríos"), hence the name of this trail. Using the layout of the railway line known as "Coastline Train" or "Rota Train", the Nature Trail runs along a little over 16 kilometres of the Cadiz coastline, from Rota to Chipiona, along the popular Costa Ballena, and reaches its end in the limits with Sanlúcar de Barrameda.
(Due to resasons beyond the control of the Nature Trails Programme, the conservation conditions of this trail are below the required standards. The footbridges are closed to pedestrians and cyclists due to their bad conservation conditions).
The old railway line was built mainly to transport the valuable sherry wine from Jerez to a port, where it would be exported by ship, mainly to England. Today, this old trade route has become an interesting coastline trail, which runs close to the Atlantic Ocean among crop fields and, beyond, large masses of pine trees.