Small fields on a steep hill near a village in the Tengger Massif (Java, Indonesia)
The grooves are made in diagonal patterns to limit erosion when it rains, and to make it easier to work the fields (since all the work is purely manual, with no machines and no animals).
For more information about the Bromo Tengger Semeru National Park, read en.wikipedia.org/wiki/Bromo_Tengger_Semeru_National_Park