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Northeastern Highlands

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Map Legend & Subregion List

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NameColor on MapEPA Code‡
Taconic Mountains58a
Acid Sensitive Adirondacks58aa
Northern and Western Adirondack Foothills58ab
Eastern Adirondack Foothills58ac
Central Adirondacks58ad
Tug Hill Plateau58ae
Tug Hill Transition58af
Rensselaer Plateau58ag
Western New England Marble Valleys58b
Green Mountains/Berkshire Highlands58c
Lower Berkshire Hills58d
Berkshire Transition58e
Vermont Piedmont58f
Worcester/Monadnock Plateau58g
Reading Prong58h
Glaciated Reading Prong/Hudson Highlands58i
Upper Montane/Alpine Zone58j
Green Mountain Foothills58k
Northern (Vermont) Piedmont58l
Quebec/New England Boundary Mountains58m
White Mountain Foothills58n
Northern Connecticut Valley58o
White Mountains/Blue Mountains58p
Sunapee Uplands58q
Sebago-Ossipee Hills and Plains58r
Western Maine Foothills58s
Upper St. John Wet Flats58t
Moosehead-Churchill Lakes58u
St. John Uplands58v
International Boundary Plateau58w
Taconic Foothills58x
Catskill High Peaks58y
Adirondack High Peaks58z

† Status: ✓ = Complete ○ = Needs Image … = Incomplete ∅ = Stub Only

This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.


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Complete w/ Images

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About the Northeastern Highlands

The Northeastern Highlands includes most of the northern and mountainous parts of New England, the Adirondacks and Catskills in New York State, and the northernmost part of the Appalachians in northern Pennsylvania.

This region consists of hills and mountains and is characterized by nutrient-poor soils, high-gradient streams, glacial lakes, and extensive forest cover that is transitional between hardwood forests to the south and coniferous forests to the north. Common forest types include Maple-Beech-Birch, Spruce-Northern Hardwood, and Northeastern Spruce-Fir.

This area is, and has always been sparsely populated. Historically, this region was farmed more, but farming has declined from the 19th century onward. Agriculture is now mostly limited to areas with the richest soils, including alluvial valleys, glacial lake basins, and areas with rich limestone soils. This area has suffered heavily from acid rain mostly generated from industrial areas to the west, which has acidified the lakes and streams as well as altered the forests.

Plant Lists & In-Region Search

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Warning! This region extends outside the continental US. We have only built range maps for the portion of plant ranges in the continental US; these lists and searches may thus have major omissions for species which only occur in the portion of this region outside the continental US.


1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.