This place is situated in Tequisquiapan, Queretaro, Mexico, its geographical coordinates are 20° 38' 20" North, 99° 57' 10" West and its original name (with diacritics) is Piedras Negras. It has straight and equally spaced meridians and parallels that meet at right angles. MapQuest Driving Directions to Piedras Negras. Piedras Negras is a city and seat of the surrounding municipality of the same name in the Mexican state of Coahuila. This map was created by a user. The Plate Carree projection is a simple cylindrical projection originated in the ancient times. This map of Piedras Negras uses Plate Carree projection. It stands at the northeastern edge of Coahuila on the U.S.-Mexico border, across the Rio Grande from Eagle Pass in the U.S. state of Texas. Get directions, maps, and traffic for Piedras Negras, Coahuila de Zaragoza. Interactive weather map allows you to pan and zoom to get unmatched weather details in your local neighbourhood or half a world away from The Weather Channel and Weather.com Driving Directions to Piedras Negras, Coahuila de Zaragoza including road conditions, live traffic updates, and reviews of local businesses along the way. Learn how to create your own. Position your mouse over the map and use your mouse-wheel to zoom in or out. Check flight prices and hotel availability for your visit. Welcome to the Piedras Negras google satellite map!