The capital city of French Guiana is Cayenne. Located on the northeastern coast of South America, Cayenne is the largest city in the region and serves as the political and administrative center of French Guiana, which is an overseas department of France. The city is characterized by its tropical climate, rich cultural diversity, and historical significance, featuring colonial architecture and vibrant markets. Cayenne is also known for its natural beauty, including beaches and rainforests, and plays a crucial role in the economic activities of the territory, including fishing and agriculture.