evidence: - Sir Creek, originally Ban Ganga, is a 96 km tidal estuary in the Indus river delta on the border of India and Pakistan. [...] - Sir Creek is considered to be one of the largest fishing grounds in Asia. Also, the marshlands are estimated to be rich in hydrocarbons and shale gas. [...] - Shifting course: Sir Creek has changed its course considerably over the years. If the boundary line is demarcated according to the Thalweg principle applied to the current channel, Pakistan and India would both lose small amounts of wetlands territory that was historically part of their provinces.