Click on the chart and use the left and right arrow keys to move between the shaded regions, in the order the data declares them. Each move announces the region and the value it is shaded by. Press B for braille, T for text descriptions, and S to toggle sonification.
The regions are read as a list in declared order rather
than as a map walked north and south. MAIDR's spatial walk needs a
centroid in degrees of longitude and latitude, and what AnyChart carries
is each feature's middle-x / middle-y — a
normalised coordinate in the map's own projection, which is not a compass
bearing and cannot be turned into one without inverting a projection the
chart does not name. Announcing it as one would tell you a region lies
north of another when the map says nothing of the kind, so it is left out.
Highlighting locates each region rather than counting shapes off: the map paints every feature of the geodata — all fifty states for the six rows above — in the geodata's order, so a region is found by matching the drawn bounds AnyChart reports for it. A region that cannot be placed switches highlighting off for the whole map rather than putting one state's outline around another.