The Republic of Trinidad and Tobago is a nation located in the southern Caribbean Sea, off the coast of Venezuela. It is an archipelagic state consisting of two main islands, Trinidad and Tobago, and 21 smaller islands, the most important being Chacachacare, Monos, Huevos, Gaspar Grande, Little Tobago and St Giles Is. The larger and more populated island is Trinidad, while the island of Tobago is smaller and less populous. Citizens are officially called Trinidadians or Tobagonians or Citizens of Trinidad and Tobago, but are informally referred to as Trinis or Trinbagonians. The tallest building in Trinidad and Tobago, the Nicholas Tower, is located in downtown Port-of-Spain.