Which is not a constituent country of the Kingdom of the Netherlands?

The Kingdom of the Netherlands encompasses four constituent countries. These are: the Netherlands, Aruba, Curacao, and Sint Maarten (St Maarten).

Bonaire is an island and special municipality within the Kingdom of the Netherlands, it is an island in the Leeward Antilles in the Caribbean Sea. Its capital is Kralendij is located near the ocean on the lee side of the island. Aruba, Bonaire and Curaçao form the ABC islands, located 80 km (50 miles) off the coast of Venezuela.

Bonaire was part of the Netherlands Antilles until the country's dissolution in 2010, when the island became a special municipality (officially, a "public body") within the country of the Netherlands. It is one of the three BES islands (acronym for their names) in the Caribbean, along with Sint Eustatius and Saba. An 80% majority of Bonaire's population are Dutch nationals, and nearly 60% of its residents were born in the former Netherlands Antilles and Aruba.

In English, the Netherlands is also called Holland or the Low Countries.