Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Q: Context: The Neumark ( listen ), also known as the New March (Polish: Nowa Marchia) or as East Brandenburg (German: Ostbrandenburg ), comprised a region of the Prussian province of Brandenburg, Germany, located east of the Oder River in territory which became part of Poland in 1945.
Question: By which body of water is Neumark located?
A:
oder