The County of Somerset, bounded on the north by a portion of the river South Esk, on the east by the Eastern tier to the Macquarie river, and thence by a line to Beaumont's rivulet, and by that rivulet to its junction with the Little Swanport river; on the south by the Little Swanport river, and by the southern boundaries of the parishes of Brisbane, Oatlands, Dulverton and Exmouth to the river Clyde, and on the west by a portion of the river Clyde, by lakes Crescent and Sorell, and by a line from lake Sorell to Wood's lake, and thence by the Lake river to its junction with the South Esk.