The phrase "a mutual boundary" is correct and usable in written English.
It can be used to describe a shared limit or dividing line between two parties, such as individuals, groups, or countries.
Example: "The two countries agreed to respect a mutual boundary that had been established through years of negotiation."
Alternatives: "shared boundary" or "common boundary".
In 2002, Mr Afeworki and the Ethiopian prime minister, Meles Zenawi, agreed that an independent commission would redraw their disputed mutual boundary.
Sebüktigin's son Maḥmūd made an agreement with the Qarakhanids whereby the Oxus was recognized as their mutual boundary.
Kummel, B. & Teichert, C. The Permian-Triassic boundary beds in central Tethys In The Permian and Triassic systems and their mutual boundary (eds Logan, A. & Hills, L. V.) 17 34 (Canadian Society of Petroleum Geologists, 1973).
Maḥmūd's agreement with the Sāmānids' Ilek Khanid successors, that the Oxus should be their mutual boundary, held, but south of the river the Ghaznavids had to contend with their own distant relatives, the Oğuz Turks.
Along the mutual boundary of intertwined basins, variant basins of attraction become narrower and narrower, meanwhile they intertwine together.
These discoveries ushered in the era of Plate Tectonics, a theory that describes the Earth's surface as broken into several large internally rigid shells or plates, and attributes most of the world's tectonic activity, including earthquakes and volcanoes, to the interaction of these plates along mutual boundaries –- midocean ridges being one of the three types of plate boundary.
If it happens that different basins of attraction have mutual boundaries, the basin boundaries can be more complicated (see [9, 10]).
A mutual interaction between these two boundaries is suggested and discussed.
Ainslie, having just started his own America's Cup team, said that the use of helicopters and motorboats to capture the racing was important for the future of the sport, but that "there just has to be clear boundaries and a mutual agreement between the sailors and the media".
We have come to a mutual agreement about where the boundaries are.
