context: West of Fort Washington Avenue, 181st Street is largely residential, bordering Hudson Heights and having a few shops to serve the local residents. East of Fort Washington Avenue, the street becomes increasingly commercial, becoming dominated entirely by retail stores where the street reaches Broadway and continues as such until reaching the Harlem River. It is the area's major shopping district.
question: ১৮১ নং সড়কের কাছে কোন নদী প্রধান শপিং ডিস্ট্রিক্ট স্পর্শ করে?
answers: Harlem