Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cola de Caballo (Spanish for "Horse Tail") is a waterfall about 40 km (25 mi) from Monterrey, Mexico, in the town of Villa de Santiago, Nuevo Le n. It is open to the public and is accessible via a walking path.Monterrey, is the capital city of the northeastern Mexican state of Nuevo Le n. The city is the ninth-largest city in Mexico and is anchor to the third-largest metropolitan area in Mexico. Monterrey serves as a commercial center in the north of the country and is the base of many significant international corporations. Until recently, the city had long been regarded as the safest in Mexico and one of the safest in Latin America.