Sir Creek

 

Sir Creek is a 96 km (60 mi)strip of water on the border of India and Pakistan

 The creek, which opens up into the Arabian Sea, divides the Gujarat State of India from the Sindh Province of Pakistan

The dispute lies in the interpretation of the maritime boundary line between Pakistan and India. Before independence, the area was part of Sind Province of British India

After independence in 1947, Sindh became a part of Pakistan while Gujarat remained a part of India.
Pakistan lays claim to the entire creek as per paragraphss 9 and 10 of the Sind Government Resolution of 1914signed between the then Government of Sindh and Rao Maharaj of Kutch

 India supports its stance by citing the thalweg doctrine in international law which states that river boundaries between two states may be, if the two states agree, divided by the mid-channel.

Under International Law,, thalwegs can acquire special significance because disputed river borders are often deemed to run along the river's thalweg.

The word thalweg is of Germanic origin and literally means "valley course".

Though Pakistan does not dispute the 1925 map, it maintains that the doctrine is not applicable in this case as it only applies to bodies of water that are navigable, which the Sir Creek is not