What's the noun for creekbanks? Here's the word you're looking for.
creek
(Britain) A (often saltwater) small inlet or bay, narrower and extending farther into the land than a cove; a recess in the shore of the sea, or of a river; the inner part of a port that is used as a dock for small boats.
(Australia, New Zealand, Canada, US) A stream of water (often freshwater) smaller than a river and larger than a brook.