In Europe most soccer is played on natural grass, a 75/25 mixture of two species, perennial ryegrass and Kentucky bluegrass.These grass species grow best in mild sea-climates, they need sunlight, vertile soil and water.
There are two alternatives for the grass surface; artificial grass and gravel.
In Google Earth I have found lots of gravel soccerfields, in Spain, Portugal and the North part of Africa, Marocco and Algeria.
I have also found them along the river Rhine between Karlsruhe and Duisburg, following the path of clay and clay-brick factories.
Seen from space distance the soccerfield gravel rejoins its origin: it becomes a brick again.
I have used my collection to built this wall, a gravel brick wall. (click on the image to see the soccerfields)