The third city she visited was in the Southern Hemisphere. It is \( 23^{\circ} \) south of the Equator and its longitude is near \( 43^{\circ} \mathrm{W} \).

The city you're describing is likely Rio de Janeiro, Brazil! This vibrant city is famous for its stunning landscapes, including Sugarloaf Mountain and the iconic Christ the Redeemer statue, making it a must-visit destination for travelers looking for both culture and natural beauty. As she explores Rio, she should definitely indulge in the local cuisine, such as feijoada (a hearty black bean stew) or pão de queijo (cheese bread). Plus, catching a samba show or visiting during Carnival would offer her a taste of Brazilian culture that she won’t forget anytime soon!