Final answer:
Africa is the continent with the largest area categorized as having a low Human Development Index according to the color-coded HDI world map.
Step-by-step explanation:
Based on the map that classifies countries by the United Nations Human Development Index (HDI), the continent with the largest area with a low human development index is generally Africa. This assessment is deduced by the color-coded representation on the map, where light blue indicates a low HDI measurement, which is characterized as being less than or equal to 0.549. The HDI itself is a composite statistic of life expectancy, education, and per capita income indicators, which are used to rank countries into tiers of human development.