The southernmost part of the world is

Cape of Good Hope, Africa
Cape of Horn, South America
Colombo, Sri Lanka
Wellington, New Zealand

The southernmost part of the world is the geographic South Pole. It is located on the Antarctic continent, and it is the point on Earth that is farthest south from the equator. The South Pole is not a landmass, but rather a point on the ice sheet that covers Antarctica. The ice sheet is constantly moving, so the exact location of the South Pole changes over time.

Cape Horn is the southernmost point of South America. It is located on the island of Tierra del Fuego, and it is a popular destination for sailors and tourists. Cape Horn is known for its rough seas and strong winds, and it has been the site of many shipwrecks.

Colombo is the capital of Sri Lanka. It is located on the west coast of the island, and it is a major port city. Colombo is a popular tourist destination, and it is home to many historical and cultural attractions.

Wellington is the capital of New Zealand. It is located on the North Island, and it is the southernmost capital city in the world. Wellington is a major economic and cultural center, and it is home to many museums, galleries, and theaters.

In conclusion, the southernmost part of the world is the geographic South Pole. It is located on the Antarctic continent, and it is the point on Earth that is farthest south from the equator.