Mexican Federal Highway 43 (Carretera Federal 43) is a Federal Highway of Mexico.

Federal Highway 43 connects the city of Salamanca

Salamanca

Salamanca is a city in western Spain, in the community of Castile and León. Because it is known for its beautiful buildings and urban environment, the Old City was declared a UNESCO World Heritage Site in 1988. It is the most important university city in Spain and is known for its contributions to...

, Guanajuato

Guanajuato

Guanajuato officially Estado Libre y Soberano de Guanajuato is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 46 municipalities and its capital city is Guanajuato....

 in the north to the capital of Michoacán, Morelia

Morelia

Morelia is a city and municipality in the north central part of the state of Michoacán in central Mexico. The city is in the Guayangareo Valley and is the capital of the state. The main pre-Hispanic cultures here were the P'urhépecha and the Matlatzinca, but no major cities were founded in the...

 in the south. Near Morelia it begins as a highway to cross the bridge over Lake Cuitzeo

Lake Cuitzeo

Lake Cuitzeo is a lake in central part of Mexico, in the Michoacán State. It is located at around . It has an area of 300-400 km². The lake is astatic, and the volume and level of water in the lake fluctuates frequently. It is the second largest freshwater lake in Mexico.Lake Cuitzeo lies in an...

, just north of the intersection of Mexican Federal Highway 15

Mexican Federal Highway 15

Federal Highway 15 is a primary north-south highway in Mexico. The highway begins in the north at the United States-Mexico border at the Mariposa Port of Entry in Nogales, Sonora, and terminates to the south in Mexico City...

. From there it is a narrow road and is 2 lanes wide in places. Because the road is a very important route, connecting the cities of Cuitzeo, Moroleón

Moroleón

Moroleón is a city located in the same name municipality of the state of Guanajuato, adjacent to the border with the state of Michoacán, in Mexico....

, Uriangato

Uriangato

Uriangato is one of 46 cities in Guanajuato, located in the borderline between the states of Guanajuato and Michoacán in the region West-Center of Mexico...

 and Valle de Santiago

Valle de Santiago

Valle de Santiago is a municipio in the Mexican state of Guanajuato, and also the name of its largest township and cabecera municipal . The municipality is located in the southern portion of the state in the Bajío region of central Mexico, and has an area of some...

. A motorway fee is now charged.