Which of the following is NOT an important factor in determining population distribution in a country or region?

The factor that is NOT an important factor in determining population distribution in a country or region is longitudinal location. Longitudinal location, which refers to the position of a place on the earth's east-west axis, is generally not a significant factor in population distribution because it does not directly affect the availability of resources or the ease of transportation. Factors such as industrial development, fertile soils for agriculture, and a well-developed transportation system are all important because they directly affect a region's ability to provide for its population and facilitate movement between different areas. Therefore, longitudinal location is not a major factor in determining population distribution in a country or region.