Cayambe is an agricultural service city in highland Ecuador. It lies at the foot of the Cayambe volcano. While the city is mainly peopled by me…Cayambe is an agricultural service city in highland Ecuador. It lies at the foot of the Cayambe volcano. While the city is mainly peopled by mestizos, the surrounding rural population is primarily composed of indigenous people who are mainly involved in subsistence agriculture, dairy farming and procurement of lumber. It is the third-largest city in Pichincha Province.