The Goldsmid Line in the early 1870s, was demarcated by the British, driven equally by the impulse to clarify British India's frontiers and establish buffers, demarcated what is now the successor Pakistan-Iran border through the Goldsmid Line. Sir Frederic John Goldsmid also arbitrated and settled the Iran-Afghanistan border. The 909-km Iran-Pakistan border, known as the Goldsmith Line, stretches from a tripoint with Afghanistan to the northern Arabian Sea.

Map showing the international borders of Iran, Pakistan, and Afghanistan leading to a Trijunction.
Map showing the southern end of the Iran–Pakistan border ending at the Gulf of Oman.
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