Published at Friday, October 11th 2019, 04:40:24 AM. Maps. By Carissa Burts.
The U.S. maintains immigration offices, called pre-clearance facilities, in eight Canadian airports with international air service to the United States (Calgary, Edmonton, Halifax, Montreal, Ottawa, Toronto-Pearson, Vancouver, and Winnipeg). This expedites travel by allowing flights originating in Canada to land at a U.S. airport without being processed as an international arrival. Canada does not maintain equivalent personnel at U.S. airports due to the sheer number of U.S. departure locations with Canada-bound flights and the limited number of flights compared to the number of U.S.-bound flights that depart major Canadian airports.
Ferry services operate between the province of New Brunswick and the state of Maine, as well as between the province of British Columbia and the states of Washington and Alaska. There are also several ferry services in the Great Lakes operating between the province of Ontario and the states of Michigan, New York, and Ohio. The ferry between Maine and Nova Scotia ended its operations in 2009, but resumed them in 2014. The Boldt Castle on Heart Island in the St. Lawrence River has a border control point on the island, but no specific location on the Canadian side. Canadians must present identification to land on the island.
The total length of the continental border is 3,145 kilometers (1,954 mi). From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at Ciudad Juárez, Chihuahua, and El Paso, Texas. Westward from El Paso–Juárez, it crosses vast tracts of the Chihuahuan and Sonoran deserts to the Colorado River Delta and San Diego–Tijuana, before reaching the Pacific Ocean.
The Mexico–United States border begins at the Initial Point of Boundary Between U.S. and Mexico, which is set one marine league (three nautical miles) south of the southernmost point of San Diego Bay. The border then proceeds for 227 kilometers (141 mi) in a straight line towards the confluence of the Colorado River and Gila River. The border continues southwards along the Colorado River for 39 kilometers (24 mi), until it reaches a point 20 miles south of the Gila River confluence. The border then follows a series of lines and parallels totaling 859 kilometers (534 mi). First, it follows a straight line from the Colorado River to the intersection of the 31st parallel north and 111th meridian west. It then proceeds eastwards along the 31st parallel. It then proceeds northwards along a meridian 100 miles west of the point where the Rio Grande crosses 31 degrees 47 minutes north, and then eastwards along that parallel until it meets the Rio Grande.
The U.S. states along the border, from west to east, are California, Arizona, New Mexico, and Texas. The Mexican states along the border are Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, and Tamaulipas. Among the U.S. states, Texas has the longest stretch of the border with Mexico, while California has the shortest. Among the states in Mexico, Chihuahua has the longest border with the United States, while Nuevo León has the shortest. Along the border are 23 U.S. counties and 39 Mexican municipalities.
The Mexico–United States border extends 3,145 kilometers (1,954 mi), in addition to the maritime boundaries of 29 kilometers (18 mi) in the Pacific Ocean and 19 kilometers (12 mi) in the Gulf of Mexico.
The Mexico–United States border (Spanish: frontera México–Estados Unidos) is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border traverses a variety of terrains, ranging from urban areas to deserts. The Mexico–United States border is the most frequently crossed border in the world, with approximately 350 million documented crossings annually.