<Table> <Tr> <Th_colspan="2"> Royal Canal An Chanáil Ríoga </Th> </Tr> <Tr> <Td_colspan="2"> Royal Canal from D'Arcy's bridge, Co . Westmeath </Td> </Tr> <Tr> <Th_colspan="2"> Specifications </Th> </Tr> <Tr> <Th> Length </Th> <Td> 90 miles (140 km) </Td> </Tr> <Tr> <Th> Status </Th> <Td> Open </Td> </Tr> <Tr> <Th> Navigation authority </Th> <Td> Waterways Ireland </Td> </Tr> <Tr> <Th_colspan="2"> History </Th> </Tr> <Tr> <Th> Construction began </Th> <Td> 1790 </Td> </Tr> <Tr> <Th> Date completed </Th> <Td> 1817 </Td> </Tr> <Tr> <Th> Date restored </Th> <Td> </Td> </Tr> <Tr> <Th_colspan="2"> Geography </Th> </Tr> <Tr> <Th> Start point </Th> <Td> Termonbarry </Td> </Tr> <Tr> <Th> End point </Th> <Td> Spencer Dock, Dublin </Td> </Tr> <Tr> <Th> Connects to </Th> <Td> River Shannon </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Royal Canal An Chanáil Ríoga </Th> </Tr>

Where does the royal canal start and finish
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