St Vincent and the GrenadinesSt Vin‧cent and the Gren‧ad‧ines /sənt ˌvɪnsənt ən ðə ˈɡrenədiːnz $ seɪnt-/a country in the east Caribbean Sea consisting of a main island called St Vincent, and some smaller islands called the Grenadines. Population: 103,220 (20148). Capital: Kingstown.