The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A river rising in several lakes and tributaries in western and central Maine and flowing about 563 km (350 mi) to Penobscot Bay, an inlet of the Atlantic Ocean. The river is an important source of power for pulpwood and paper mills. The bay was first explored by English navigators in 1603.