Faults on a map are shown with

light, thin lines
a stubby t-shaped line
a capital letter
dark, thick lines

Faults on a map are shown with dark, thick lines. Maps that show the different man-made and natural features of the Earth's surface are called topographic maps. The lines representing faults differ in thickness and darkness depending on the properties of the fault. Because of this, it is easier for people to identify fault lines within their area.

Nigeria and south africa

i didn’t understand your question but archipelagos are groups of island hope this