The Moordener Kill is a 15.5 miles (24.9 km) tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 to the Hudson River

Hudson River

The Hudson is a river that flows from north to south through eastern New York. The highest official source is at Lake Tear of the Clouds, on the slopes of Mount Marcy in the Adirondack Mountains. The river itself officially begins in Henderson Lake in Newcomb, New York...

 that flows through southwestern Rensselaer County, New York

Rensselaer County, New York

Rensselaer County is a county in the U.S. state of New York. As of the 2010 census, the population was 159,429. Its name is in honor of the family of Kiliaen van Rensselaer, the original Dutch owner of the land in the area. Its county seat is Troy...

, in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. Moordener Kill translates to "Murderer Creek", because the word moordener is the Dutch word for "murderer". The name comes from the fact that the creek was the site of an ambush of Dutch settlers by Native Americans in 1643 in which 7 men and 2 women were killed.