THIRD CLAUSE. The Contracting Parties agree that the navigable part of the river of the border line, as described in this supplementary agreement’s first clause, runs along the centreline of the main channel. The non- navigable part of the river runs along the centreline of the water flow or main stream. The exact position of the main channel and what is regarded as the centreline of the border’s main channel, the river or the main stream’s centreline and the rivers islands and islets whose ownership is divided in view of the above, will be specifically defined during the time in which Sino-Russian border is being demarcated. The main basis for determining the main channel is the depth of water combined with the main channel’s width, the radius of curvature should also be taken into consideration. The centreline of the main channel is indicated by the centreline of the water surface in between the main channel’s two corresponding isobaths. PA-X, Peace Agreement Access Tool ▇▇▇.▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇ The basis for determining the main stream is the rate of flow at the mid-water level.
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