names included the four “lower reaches” through the Hudson Highlands (Seylmakers rack, Cocks rack, Hoogh rack, and Vosserack) plus the four “upper reaches” from Inbocht Bay to Kinderhook (Backers rack, Jan Pleysiers rack, Klevers rack, and Harts rack). A ninth reach was described as “the long reach” by the Englishman Robert Juet and designated as the Langerack by the Dutch. An embellished (and partly erroneous) list of “The Old Reaches” was published in a tourist guidebook for steamboat passengers in the nineteenth century. Course Sources The source of the Hudson River is Lake Tear of the Clouds in the Adirondack Park at an elevation of . However, the river is not cartographically called the Hudson River until miles downstream. The river is named Feldspar Brook until its confluence with the Opalescent River, and then is named the Opalescent River until the river reaches Calamity Brook, flowing south from the outlet of Henderson Lake. From that point on, the stream is cartographically known as the Hudson River. The U.S. Geological Survey (USGS) uses this cartographical definition. The longest source of the Hudson River as shown on the most detailed USGS maps is the "Opalescent River" on the west slopes of Little Marcy Mountain, originating two miles north of Lake Tear of the Clouds, several miles, past the Flowed Lands, to the Hudson River. and a mile longer than "Feldspar Brook", which flows out of that lake in the Adirondack Mountains. Popular culture and convention, however, more often cite the photogenic Lake Tear of the Clouds as the source. Upper Hudson River Using river names as seen on maps, Indian Pass Brook flows into Henderson Lake, and the outlet from Henderson Lake flows east and meets the southwest flowing Calamity Brook. The confluence of the two rivers is where maps begin to use the Hudson River name. South of the outlet of Sanford Lake, the Opalescent River flows into the Hudson. The Hudson then flows south, taking in Beaver Brook and the outlet of Lake Harris. After its confluence with the Indian River, the Hudson forms the boundary between Essex and Hamilton counties. The Hudson flows entirely into Warren County in the hamlet of North River, and takes in the Schroon River at Warrensburg. Further south, the river forms the boundary between Warren and Saratoga Counties. The river then takes in the Sacandaga River from the Great Sacandaga Lake. Shortly thereafter, the