All that portion of the State of Nevada situate within the following boundaries shall be and constitute the County of Lincoln: Beginning at the Red Bluff Springs (about 15 miles east of Reveille District) and running thence due east to the state line of this state; thence south along the state line to the southerly boundary line of this state; thence along the southerly boundary line to a point due south of Red Bluff Springs; thence north to the place of beginning.