Tumtum River

Tumtum River
Name origin: Chinook Jargon word for "heart", referring to the heart of the valley through which the river flows
Country	United States
State	Oregon
Counties	Lincoln, Benton
Source	Central Oregon Coast Range
- location	near Burnt Woods, Lincoln County
- elevation	1,018 ft (310 m)
- coordinates
Mouth	Marys River
- location	near Alder, Benton County
- elevation	584 ft (178 m)
- coordinates
Length	9 mi (14 km)
Basin	19.1 sq mi (49 km2)
Location of the mouth of the Tumtum River in Oregon

The Tumtum River is a 9-mile (14 km) tributary of the Marys River in Benton and Lincoln counties in the U.S. state of Oregon. The river rises in the Central Oregon Coast Range west of Burnt Woods and passes through the communities of Burnt Woods and Blodgett. It then drains into the Marys River north of Alder.

The name Tumtum is a Chinook Jargon word for "heart", and the river was so-named because it was considered to be the heart of the valley through which it flowed. When the Burnt Woods post office was to be named, one of the names proposed to the Post Office Department was Tumtum.