At its widest points, the Lower Peninsula is 277 miles (446 km) long from north to south and 195 miles (314 km) from east to west. It contains nearly two-thirds of Michigan's total land area. The surface of the peninsula is generally level, broken by conical hills and glacial moraines usually not more than a few hundred feet tall. The western coast features extensive sandy beaches and dunes. It is divided by a low water divide running north and south. The larger portion of the state is on the west of this and gradually slopes toward Lake Michigan. The highest point in the Lower Peninsula is not definitely established but is either Briar Hill at 1,705 feet (520 m), or one of several points nearby in the vicinity of Cadillac. The lowest point is the surface of Lake Erie at 571 feet (174 m).

What is the highest point in michigan's lower peninsula? Let's have some stream of consciousness first.
The relevant information to answer the above question is: The highest point in the Lower Peninsula is not definitely established but is either Briar Hill at 1,705 feet (520 m), or one of several points nearby in the vicinity of Cadillac. So, the answer is either Briar Hill at 1,705 feet ( 520 m ) , or one of several points nearby in the vicinity of Cadillac.