Everfair map confusion - what do you think?
I’m just starting Nisi Shawl’s Everfair, which made the Nebula finalists this year (but missed the Hugos, finishing 8th on the Best Novel ballot). The frontispiece is this map, which I found a little confusing:

The book is an alternate history where the Fabians create an idealistic colony in the Congo, and the map shows the different stages of its territorial expansion.
The problem is that the map legend has four colours, but the map itself seems to have only three.
My best guess is that the south-eastern corner is the 1893 first buy, the 1897 second buy is missing (I don’t see anywhere on the map coloured that dark), the north-east is the bit conquered by 1904, and the western spur the land offered in 1914.
Maybe it will become clear as I read the book.

The book is an alternate history where the Fabians create an idealistic colony in the Congo, and the map shows the different stages of its territorial expansion.
The problem is that the map legend has four colours, but the map itself seems to have only three.
My best guess is that the south-eastern corner is the 1893 first buy, the 1897 second buy is missing (I don’t see anywhere on the map coloured that dark), the north-east is the bit conquered by 1904, and the western spur the land offered in 1914.
Maybe it will become clear as I read the book.