How many types?!

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I've just started constructing the world map for my trading game, Merchantman. I want a lot of detail in it (including rivers of varying navigability) so the map image is pretty big (2355x1200 pixels). The plan is to build the map in Photoshop using various colours for terrain types and then read it into an editor to convert the BMP to a huge array of Types (each pixel will form one map square, data for which is stored in a type), allow a few other pieces of data to be added to each square and then save it as a game file.

Each type in the array will hold 5 integers and two 2-character strings, ideally with 5 other integers to cover events that effect map regions.

Before I go too far down this path does anyone know if an array of 2.8 million types is feasible?

I can shrink the map if I have to but I'd rather not if I don't. 2.8 million is a lot though...

Anyone got any helpful thoughts?