ABSTRACT
While the concept of sustainability is popular and potentially useful, the word is frequently misapplied. From a regional point of view, the condition required to achieve sustainability is that areas need to be environmentally self-reliant. Most quantitative research concerning environmental capacity focuses only on counting the numbers of a certain species within a limited narrow biotope space, rather than within a specific region. In order to investigate and measure regional environmental capacity, it is necessary to first develop a method to describe the regional environment. Sustainable population is defined as the population maintained by the primitive agricultural processes within the region. The first calculation method is based on the total population in 1664. The total regional population divided by the total regional koku level determines the value. Though there might be some differences among individuals and eras, this research estimates the value of from the amount of personal rice consumption.
