No, a river can't start from the ocean, but it can start from mountans and lakes.
The Numbers Start with the River was created in 1971.
The Congo river does not start in the Rocky Mountains.
Danube river, Delaware river
Mississippi river
the nile river.
The start of a river is its headwaters and, just in case you were wondering, the end is its mouth.
The duration of The Numbers Start with the River is 900.0 seconds.
River Dee River Don River Deveron
Ohio River.
There is no 'river UK' !
Tygart Valley River