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Sebago-Ossipee Hills and Plains

Ecoregion in Appalachian Mountains in NH, ME

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The Sebago-Ossipee Hills and Plains ecoregion is a transitional area between the northern reaches of Ecoregion 59 and the more mountainous Northeastern Highlands (58). It contains some rugged hills and isolated mountains scattered on a landscape of rolling plains that are dotted with numerous lakes and wetlands. This “lake region” includes Lake Winnepesaukee, the largest lake in New Hampshire. Sandy glacial till is common, along with some glacial outwash kames, eskers, and deltaic deposits. Well-drained, sandy loam and loamy sand soils are typical. Relative to other parts of Ecoregion 58, these are somewhat warm and dry soils. Most of the region has soils with a frigid temperature regime, although in New Hampshire, some mesic soils occur in the southwest part of the region. The ecoregion is in a vegetation transition zone from warm temperate to cool temperate and boreal. Hemlock-hardwood-pine and some northern hardwood-conifer forest types occur. It mostly lacks the Appalachian oak-pine found in Ecoregion 59h to the south. On some glacial outwash deposits, fire-dependent pitch pine-scrub oak woodlands occur. In Maine, several northern species reach their southern limits near Sebago Lake.

— EPA

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