Oman–Yemen border

[1] The border consists essentially of a single straight line orientated NW-SE, from the Saudi tripoint down to the Arabian Sea coast at Ras Darbat Ali.

The exception is a small triangular 'kink' roughly halfway along the boundary line, which juts into Yemen so as to include the town of Habarut within Oman.

Topographically the border traverses the Rub' al Khali desert in the north and the Jabal Qamar in the Dhofar Mountains in the south.

The far east of what is today Yemen historically formed the Sultanate of Mahra, which became part of Britain's Aden Protectorate in 1866, though retaining a degree of autonomy.

"[4] A British letter of 1947 states that "the Frontier is shown as being on the west side of Ras Dharbar Ai in a Survey of India map of south-east Arabia 1:2,000,000, but on what authority this was done is not known.