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thalweg
noun
The line that connects the lowest points in a valley or river channel, and thus the line of fastest flow along a river's course.
Exact(4)
The currently recognized border between Suriname and Guyana along the Courantyne is also in contention Suriname claims sovereignty over the entire river and thus views its west bank as the border, while Guyana claims that the thalweg, or deepest channel of the river, is the boundary.
Following the thalweg along its many twists and turns, the riverine border adds up to about 95 miles.
Usually, borders that follow rivers run along the center of the river's main navigable channel, what international law refers to as the thalweg principle.
This has been a sensitive issue since the 1975 Algiers Accord, in which Iraq made a concession in agreeing the southern border as the thalweg, or deepest channel, of the Shatt al-Arab waterway (known to Iranians as Arvand Rud): Saddam Hussein revoked the agreement in 1980 as he launched an eight-year war with Iran, but it was restored as part of the ceasefire in 1988.
Similar(1)
Having been determined by the 1848 peace treaty that ended the Mexican-American War, the border traces the river's deepest channel the thalweg which, because the riverbed frequently shifts according to the water's whims, is in some respects notional.
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