Antigua and Barbuda is a sovereign archipelagic country composed of Antigua, Barbuda, and numerous other small islands. Antigua and Barbuda has a total area of 440 km², making it one of the smallest countries in the Caribbean. The country is mostly flat, with the highest points on Antigua being in the Shekerley Mountains and on Barbuda …Antigua and Barbuda is a sovereign archipelagic country composed of Antigua, Barbuda, and numerous other small islands. Antigua and Barbuda has a total area of 440 km², making it one of the smallest countries in the Caribbean. The country is mostly flat, with the highest points on Antigua being in the Shekerley Mountains and on Barbuda the Highlands. The country has a tropical savanna climate, with pockets of tropical monsoon in Antigua's southwest. Its largest city is St. John's.