BOUNDARY of states, districts, town, farms etc. are demarcated on different maps but watershed is demarcated only on toposheets because these are the only maps, which show the contour LINES and the drainage lines. INITIALLY the DEMARCATION of watershed is done on toposheets and then this demarcation can be SUPERIMPOSED on other maps like cadastral maps, soil maps, geological maps etc. It’s demarcation depends on the selected point on the drainage line. Each selected point will have a different watershed boundary and size. 

Boundary of states, districts, town, farms etc. are demarcated on different maps but watershed is demarcated only on toposheets because these are the only maps, which show the contour lines and the drainage lines. Initially the demarcation of watershed is done on toposheets and then this demarcation can be superimposed on other maps like cadastral maps, soil maps, geological maps etc. It’s demarcation depends on the selected point on the drainage line. Each selected point will have a different watershed boundary and size.