distribution map; distribution diagram
A map or diagram showing the geographical or spatial distribution of something, such as population, species, or resources.
This distribution map shows the population density of the area.
We conducted field surveys to create a distribution map of the plants.
グラフ is a chart or graph, often abstract; 分布図 is typically a map-based representation.
histogram
Compound of 分布 (ぶんぷ, 'distribution') and 図 (ず, 'diagram, map').