Monocacy Creek (Lehigh River tributary)

A tributary, or affluent, is a stream or river that flows into a larger stream or main stem river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. The Irtysh is a chief tributary of the Ob river and is also the longest tributary river in the world with a length of 4,248 km (2,640 mi). The Madeira River is the largest tributary river by volume in the world with an average discharge of 31,200 m3/s (1.1 million cu ft/s).

The Lehigh River is a 109-mile-long (175 km) tributary of the Delaware River in eastern Pennsylvania. The river flows in a generally southward pattern from the Pocono Mountains in Northeastern Pennsylvania through Allentown and much of the Lehigh Valley before enjoining the Delaware River in Easton.

Northampton County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 312,951. Its county seat is Easton. The county was formed in 1752 from parts of Bucks County. Its namesake was the county of Northamptonshire in England, and the county seat of Easton was named for the country house Easton Neston in Northamptonshire.

The United States of America, commonly known as the United States or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City.

Chapman is a borough in Northampton County, Pennsylvania. The population of Chapman was 223 as of the 2020 census. Chapman is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th most populous metropolitan area in the U.S. as of the 2020 census.

The Lehigh Valley, known colloquially as The Valley, is a geographic and metropolitan region formed by the Lehigh River in Lehigh County and Northampton County in eastern Pennsylvania. It is a component valley of the Great Appalachian Valley bounded to its north by Blue Mountain, to its south by South Mountain, to its west by Lebanon Valley, and to its east by the Delaware River and Warren County, New Jersey. The Valley is about 40 miles (64 km) long and 20 miles (32 km) wide. The Lehigh Valley's largest city is Allentown, the third largest city in Pennsylvania and the county seat of Lehigh County, with a population of 125,845 residents as of the 2020 census.

Bushkill Township is a township in Northampton County, Pennsylvania. Its population was 8,178 at the 2010 census. It is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th most populous metropolitan area in the U.S. as of the 2020 census.

Moore Township is a township in Northampton County, Pennsylvania. The population of Moore Township was 9,198 at the 2010 census. The township is located in the Lehigh Valley, which had a population of 861,899 and was the 68th most populous metropolitan area in the U.S. as of the 2020 census.

East Allen Township is a township in Northampton County, Pennsylvania. The population of East Allen Township was 4,903 at the 2010 census. East Allen is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th most populous metropolitan area in the U.S. as of the 2020 census.

Lower Nazareth Township is a township in Northampton County, Pennsylvania. The population of Lower Nazareth Township was 5,674 at the 2010 census. The township is located in the Lehigh Valley, which had a population of 861,899 and was thus the 68th most populous metropolitan area in the U.S. as of the 2020 census.

Hanover Township is a township in Northampton County, Pennsylvania. The population of Hanover Township was 10,866 at the 2010 census.

Bethlehem is a city in Northampton and Lehigh Counties in the Lehigh Valley region of eastern Pennsylvania, United States. As of the 2020 census, Bethlehem had a total population of 75,781. Of this, 55,639 were in Northampton County and 19,343 were in Lehigh County. It is Pennsylvania's eighth most populous city. The city is located along the Lehigh River, a 109-mile-long (175 km) tributary of the Delaware River.