Boundary Street: historically, the street marked the boundary between the southern part of Kowloon, ceded by Qing China to the United Kingdom in 1860, and the northern part of Kowloon (New Kowloon), which remained part of China until it was leased as part of the New Territories to the United Kingdom in 1898 for 99 years. After the lease, the boundary was renamed from Boundary Line to Old Frontier Line. (source: Wikipedia)

Boundary Street (a road in Hong Kong)