Article: The most famed Carnival festivities are in Guaranda (Bolivar province) and Ambato (Tungurahua province). In Ambato, the festivities are called Fiesta de las Flores y las Frutas (Festival of the Flowers and Fruits). Other cities have revived Carnival traditions with colorful parades, such as in Azogues (Cañar Province). In Azogues and the Southern Andes in general, Taita Carnival is always an indigenous Cañari. Recently a celebration has gained prominence in the northern part of the Sierra in the Chota Valley in Imbabura which is a zone of a strong afro-Ecuadorian population and so the Carnival is celebrated with bomba del chota music.

Now answer this question: What is there a large population of in the Chota Valley?
afro-Ecuadorian