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21°50′52″N 106°45′28″E / 21.84778°N 106.75778°E
Lạng Sơn () is a city in far Northern Vietnam, and the capital of Lạng Sơn Province. It is accessible by road and rail from Hanoi, the Vietnamese capital, and it is the northernmost point on National Route 1.
Biên Hòa (Northern accent: , Southern accent: ) is a former city in Vietnam and was the capital city of Đồng Nai Province. Situated northeast of Ho Chi Minh City (also known as Saigon), Biên Hòa is connected to it via Hanoi Highway (part of National Route 1). As a class-1 provincial city, it is the sixth largest city in Vietnam by population.
Biên Hòa ceased to exist as a municipal city on 1 July 2025, following the elimination of district level units in Vietnam, and became a part of the Ho Chi Minh City metropolitan area.