For years the mountainous province of Ifugao have been carefully cultivated with terraced fields. These rice terraces illustrate the ability of human culture to adapt to new social and climate pressures as well as to implement and develop new ideas and technologies. They also epitomize a harmonic, sustainable relationship between humans and their environment. The structures' original builders used stone and mud walls to carefully carve and construct terraces that could hold flooded pond fields for the cultivation of rice. They also established a system to water these plots by harvesting water from mountaintop forests. These engineering feats were done by hand as was the farming itself.