Boreas River

{{short description|River in New York, United States}}

{{Use American English|date=February 2025}}

{{Infobox river

| name = Boreas River

| name_native =

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| image = File:Boreas River by Hewitt Eddy Trail 2012.jpg

| image_caption = Boreas River by Hewitt Eddy Trail

| map =

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| pushpin_map = New York Adirondack Park#USA

| pushpin_map_size =

| pushpin_map_caption= Location of the mouth of the Boreas River

| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = New York

| subdivision_type3 = Region

| subdivision_name3 =

| subdivision_type4 = Counties

| subdivision_name4 = Essex, Hamilton

| subdivision_type5 = Towns

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| source1 = Boreas Ponds

| source1_location = NNE of Boreas River (hamlet)

| source1_coordinates= {{coord|44.0431124|-73.9056959|format=dms}}{{cite gnis

| id = 944460

| name = Boreas River

| access-date = 2019-06-05 }}

| source1_elevation = {{convert|1978|ft|abbr=on}}{{cite gnis

| id = 944459

| name = Boreas Ponds

| access-date = 2019-06-05 }}

| mouth = Hudson River

| mouth_location = SE of Forks Mountain

| mouth_coordinates = {{coord|43.7975639|-74.0479163|format=dms|display=inline,title}}

| mouth_elevation = {{convert|1161|ft|abbr=on}}

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Boreas River is a river in Essex County and Hamilton County in the U.S. State of New York. Boreas River begins at Boreas Ponds north-northeast of the Hamlet of Boreas River and flows southeastward before converging with the Hudson River southeast of Forks Mountain.