Satellite view of the Chicago Harbor Lock separating the Chicago River (left side of image) from Lake Michigan (right side of image)
NASA
NASA World Wind Screenshot - cropped from image at <a class="external free" href="https://commons.wikimedia.org/wiki/File:Navy_Pier_(USGS).png">https://commons.wikimedia.org/wiki/File:Navy_Pier_(USGS).png</a>