Milpa Alta is a borough in Mexico City. It lies in the southeast corner of the nation's capital, bordering the State of Mexico and Morelos. It is the l…Milpa Alta is a borough in Mexico City. It lies in the southeast corner of the nation's capital, bordering the State of Mexico and Morelos. It is the least populated, second largest and most rural of all the boroughs. It is also one of the most traditional areas of the city, with over 700 religious and secular festivals during the year and an economy based on agriculture and food processing, especially the production of nopal cactus, barbacoa and mole sauce.