(DC) (Canal Trust) Spend your weekend with us in the eastern part of the park and make a difference. The C&O Canal National Historical Park follows the Potomac River for 184.5 miles between Georgetown and Cumberland and is one of the most visited national park sites in the country. The C&O Canal Trust is the park’s official nonprofit partner, committed to supporting the park and local communities through fundraising initiatives, expanding accessibility and broadening support through programs that highlight the park’s historical, natural, and cultural heritage.