Where to download world map for data viz?

Anyone know where I can download a simple flat world map with the ability to transform between pixels and longitude/latitude. The only marking on the map should be country boundaries (not even names).

I looked at jVector map, which seems overkill for what I want. Google maps probably has it, but after ransacking the map developer web site for a few hours, I can’t find it.

Thanks

You don’t need to download a map, in D3, you usually use GeoJSON and TopoJSON.
https://bost.ocks.org/mike/map/

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