What river is being crossed in this famous painting?

This is the famous painting of Washington Crossing the Delaware by Emanuel Leutze. It depicts the Christmas Night, December 25, 1776, when George Washington led Continental army soldiers across the Delaware River to attack Britain’s Hessian army at Trenton, New Jersey. This successful surprise attack provided a much-needed victory for Britain’s former colonies as they struggled for freedom.

Surprisingly, a German artist painted it in response to German politics. Emanuel Leutze, born in Germany in 1816, moved to America as a child, but returned to Germany to study art in 1840. With a strong belief in liberal democracy, he painted this American Revolution scene to inspire German reformers. When his first painting of Washington’s crossing became popular in Europe, he shipped this second huge version to the United States in 1851. It became an instant success with more than fifty thousand people coming to see it. It is in the Metropolitan Museum of Art, (New York).