The world's smallest ocean is the Arctic Ocean. Covering an area of about 15 million square kilometers (5.8 million square miles), it is bordered by several countries, including the United States, Canada, Russia, and Norway. Despite its size, the Arctic Ocean plays a crucial role in the Earth's climate, influencing weather patterns and supporting unique ecosystems. The ocean is characterized by its icy waters, particularly during winter, and its seasonal melting during summer months. Environmental changes, like climate change, significantly impact the Arctic Ocean, affecting wildlife and human activities in the region.