These two groups are the Javanese (41 percent of the total population) and Sundanese (15 percent of the total population). Both groups originate from the island of Java, Indonesia's most populous island, which contains almost sixty percent of the country's total population. When the island of Sumatra is included, this figure rises to approximately eighty percent of Indonesia's total population, indicating a significant population concentration in the western part of the country. The most populous province is West Java (with more than 43 million people), while the least populous province is that of West Papua in the far eastern region of Indonesia (having around 761,000 people).