Here are the outline world map images with country borders (political world maps). They can have transparent areas or solid color areas and they all have thin black outlines - borders.
Code of the map: b6a
Land color: white
Water color: white
Outline thickness: thin
Code of the map: b4a
Land color: transparent
Water color: transparent
Outline thickness: thin
Code of the map: b5a
Land color: white
Water color: transparent
Outline thickness: thin
Code of the map: b8a
Land color: transparent
Water color: white
Outline thickness: thin
Code of the map: b10a
Land color: gray
Water color: white
Outline thickness: thin