Question

Five cities south of 30n and west of 15e

Answer 1

That point is in Libya. So the entire western 'hump' of Africa qualifies,
and so does the entire continent of South America.

In Africa, you have Bamako, Conakry, Ouagadougou, Accra, Abuja,
and Luanda.

In the Caribbean alone, you have Havana, Kingston, Port-au-Prince,
Montego Bay, and Port-of-Spain.

In South America, without resorting to towns and villages, you have
the capital cities of more than a dozen countries.

Answer 2

This point is Libya, so the cities could be in South America for example

So we have

Mexico City
Montevideo
Brasilia
Buenos Aires
Asuncion