The Penobscot River is a major river located in the state of Maine, USA. It stretches approximately 109 miles and flows from Mount Katahdin to Penobscot Bay. The river is known for its scenic beauty and is an important waterway for both wildlife and human activities. Historically, the Penobscot River has been significant for the Penobscot Nation, a Native American tribe that has lived in the region for thousands of years. The river supports various ecosystems and is popular for recreational activities such as fishing, kayaking, and canoeing.