Which preposition to use with moldau

with Occurrences 2%

Prague with its spires and towers lies in the valleys below, through which curves the Moldau with its green islands, disappearing among the hills which enclose the city on every side.

towards Occurrences 1%

These operations, and the chain bridge which spans the Moldau towards the southern end of the city, are the only things which look modernevery thing else is old, strange and solemn.

Which preposition to use with  moldau