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About the Midcoast

The Midcoast is a region located entirely within Maine, along the coast in the middle part of the coastline.

This region is characterized by a rugged, rocky coastline with long peninsulas and numerous small islands, separated by deep, narrow estuaries, mostly oriented in a north-south direction, reflecting the glaciation that carved out these features. The bedrock here is a mix of metamorphic rocks, mixed with some granite. There are bedrock outcroppings throughout, especially along the coast, and there is thin and discontinuous glacial drift, along with silt and clay of marine origin, and glacial till. Soils here have considerable diversity in texture, ranging from excessively-well-drained to poorly-drained, but are mostly acidic, often rocky, and low in fertility.

The climate is humid and continental with exceptionally high precipitation relative to what is typical for an area of such low elevation and northerly latitude. Precipitation is roughly equally distributed year-round. The climate is heavily influenced by the ocean, leading to high relative humidity, and milder winters and cooler summers than areas inland.

This region is a transitional zone between more southerly and northerly forest types, and has the highest species richness of woody plants in Maine. The dominant forest cover is Red oak-Northern Hardwoods-White Pine forest, featuring northern red oak (Quercus rubra), red maple (Acer rubrum), sugar maple (Acer saccharum), American beech (Fagus grandifolia), eastern white pine (Pinus strobus), eastern hemlock (Tsuga canadensis), and some northern white-cedar (Thuja occidentalis). On richer sites there is beech-birch-maple forest. Small islands and peninsulas with less-developed, rockier soils have spruce-fir and pitch pine (Pinus rigida) woodlands. Farther inland, freshwater tidal marshes feature wild rice, pickerelweed (Pontederia cordata), and bulrush.

As with much of New England, this region was logged and heavily farmed, but agriculture has declined in recent years and most of the land has returned to being forested. The little remaining agriculture is mostly hay production and pastureland. The population is much lower here than areas to the southwest; Brunswick is the largest town. There is some commercial fishing along the coast, shipbuilding, especially the Bath Iron Works, as well as some tourism and recreation, quarrying and mining, and cement production.

This region is bordered to the southwest along the coast by the Gulf of Maine Coastal Lowland and to the northeast by the Downeast Coast. Inland, it is bordered by the Central Maine Embayment.

This photo taken near Cushing Briggs, ME, shows a typical Midcoast scenery, with a rocky shoreline with coastal islands and peninsulas. The nutrient-poor areas adjacent to the water are usually dominated by conifers, with white pine dominant here. This is a crop and edit of a photo © Rich Brooks, CC BY 2.0, Source.


1. Griffith, G.E., Omernik, J.M., Bryce, S.A., Royte, J., Hoar, W.D., Homer, J.W., Keirstead, D., Metzler, K.J., and Hellyer, G. "Ecoregions of New England (Poster)", U.S. Geological Survey (2009) Web.