Ecuador
Ecuador's capital is Quito, which is in the province of Pichincha in the Sierra region. Its largest city is Guayaquil, in the Guayas Province. Cotopaxi, just south of Quito, is one of the world's highest active volcanoes. The top of Mount Chimborazo (6,268 m, or 20,560 ft, above sea level), Ecuador's tallest mountain, is the most distant point from the center of the Earth on the Earth's surface because of the ellipsoid shape of the planet.
Riobamba
Riobamba (, full name San Pedro de Riobamba) is the capital of the Chimborazo Province in central Ecuador, which is located at the Chambo River Valley of the Andes. It is south of Ecuador's capital Quito and located at 2,754 m on the Avenue of the Volcanoes. The city is an important regional transport center as well as being a stop on the Pan-American Highway that runs through Ecuador. Riobamba stands as one of the largest cities in the central portion of Ecuador's Sierra region.