The famous iris dataset: 150 iris flowers, divided into three classes; 50 of type setosa, 50 of type versicolor, and 50 of type virginica. Four features of each flower were measured: the length and width of the petals, and the length and width of the sepals.

The three types of flowers each occupy a region on the map. Their position is based on their shared characteristics.

Without any extra labeling, this dataset contains only two obvious clusters that can clearly be distinguished on the map.

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Source: Wikipedia