گزارش خطا در معنی کلمه 'خط القعر'

1 Law:: thalweg a : a line following the lowest part of a valley whether under water or not b : the line of continuous maximum descent from any point on a land surface or one crossing all contour lines at right angles c : surface water percolating beneath and in the same direction as a surface stream course

2 Law:: the middle of the chief navigable channel of a waterway which constitutes a boundary line between states)