Oryza sativa times can be found in the Cordillera Mountain Range of Luzon in the provinces of Apayao, Benguet, Mountain Province and Ifugao. The Banaue Rice Terraces (Tagalog: "Hagdan-hagdang Palayan ng Banaue") are 2,000- to 3,000-year-old terraces that were carved into the mountains by ancestors of the Batad indigenous people. The terraces are commonly thought to have been built with minimal equipment, largely by hand. The terraces are located about 1,500 m (5,000 ft) above sea level and cover 10,360 km (about 4,000 mi) of mountainside. They are fed by an ancient irrigation system from the rainforests above the terraces. Evidence of
Plant genome assembly products were used to clone remaining gaps, and YACs allowed the characterization of telomere sequences. The resulting sequenced regions were 115.4 Mb of the 125 Mb predicted size of the genome and a total of 25,498 of protein-coding genes. To sequence and assemble the genome of Oryza Sativa (japonica), the same strategy was used. For Oryza Sativa a total of 3,401 mapped clones in a minimum tiling path were selected from the physical map and assembled. One of the most important crops in the world, maize (Zea mays), is the last plant genome project primarily based on Sanger BAC-by-BAC strategy.