<Tr> <Td> - location </Td> <Td> Kenli District, Dongying, Shandong </Td> </Tr> <Tr> <Td> - elevation </Td> <Td> 0 m (0 ft) </Td> </Tr> <Tr> <Td> - coordinates </Td> <Td> 37 ° 46 ′ 48" N 119 ° 15 ′ 00" E ﻿ / ﻿ 37.78000 ° N 119.25000 ° E ﻿ / 37.78000; 119.25000 Coordinates: 37 ° 46 ′ 48" N 119 ° 15 ′ 00" E ﻿ / ﻿ 37.78000 ° N 119.25000 ° E ﻿ / 37.78000; 119.25000 </Td> </Tr> <Tr> <Th> Length </Th> <Td> 5,464 km (3,395 mi) </Td> </Tr>

When did the huang he river valley civilization begin