Where is Angostura, after which the "bitters" tonic and flavourer is named?

Angostura bitters is a concentrated bitters (herbal alcoholic preparation) based on gentian, herbs, and spices, produced by House of Angostura in Trinidad and Tobago. It is typically used for flavouring beverages, or less often, food. The bitters were first produced in the town of Angostura (now Ciudad Bolívar, Venezuela), hence the name, but do not contain angostura bark. The bottle is recognisable by its distinctive oversized label and yellow cap. Angostura is Spanish for "narrowing", the town of Angostura having been at the first narrowing of the Orinoco River.