Saint Kitts and the neighbouring island of Nevis constitute one country: the Federation of Saint Kitts and Nevis. Saint Kitts and Nevis are separated by a shallow 3-kilometre (2 mi) channel known as The Narrows.

St. Kitts is part of a cluster of islands in the northern Leeward Islands, with Nevis being its closest neighbor. The two islands are separated by a shallow channel called "The Narrows," which is only 2 miles (3.2 km) wide at its narrowest point. A regular ferry service connects the capitals of Basseterre (St. Kitts) and Charlestown (Nevis) in about 45 minutes, while a smaller water taxi can make the crossing in just 10 minutes. Beyond Nevis, the closest islands are Saint Eustatius (Statia), located about 7 miles (11 km) to the northwest, and Saba, roughly 25 miles (40 km) away. The French island of Saint Barthélemy (St. Barts) is also relatively close, about 40 miles (64 km) to the north. In 2026, the Makana Ferry provides a convenient regional link between St. Kitts, Statia, Saba, and St. Maarten, making it easy to "island hop" through this historically and culturally diverse corner of the Caribbean. Whether you are looking for the lush volcanic hiking of Statia or the high-end glamour of St. Barts, St. Kitts serves as a perfect central hub for exploration.