<Tr> <Td> Port Royal State Park </Td> <Td> Montgomery, Robertson </Td> <Td> 26 acres </Td> <Td> </Td> </Tr> <Tr> <Td> Radnor Lake State Natural Area </Td> <Td> Davidson </Td> <Td> 1,332 acres </Td> <Td> 1973 </Td> </Tr> <Tr> <Td> Red Clay State Park </Td> <Td> Bradley </Td> <Td> 263 acres </Td> <Td> </Td> </Tr> <Tr> <Td> Reelfoot Lake State Park </Td> <Td> Lake, Obion </Td> <Td> </Td> <Td> </Td> </Tr>

How many state parks are there in tennessee