Renewable fresh water resources per capita (cubic meters) v/s % of population with access to improved water source (colored by regions)
In South Asia, most of the countries in South Asia have at least 80% of population with access to drinking water from an improved source but Afghanistan is an outlier – only 48% have access to it.
In Latin America and the Caribbean, Haiti is an exception. Only 63% have access as compared to over 80% of the population in other countries.
Papua New Guinea comes across as an outlier – despite having one of the highest values of renewable freshwater resources per capita, only 40% of the population has access to improved water source. (One reason could be that it is one of the most rural countries with only 18% of the population living in urban areas, according to Wikipedia)