Question: Where does the Columbia River meet the mouth of the river the Salmonberry River flows into?

full_context: Document 1: Baughman Creek (Oregon): Baughman Creek is a small stream located in Tillamook County, Oregon. The stream originates from two sources east of Oceanside and exits into the Pacific Ocean at Oceanside Beach State Recreation Site.
Document 2: Nevill Bay: Nevill Bay is a long and narrow waterway in Kivalliq Region, Nunavut, Canada. It is located in northwestern Hudson Bay between Rankin Inlet and Whale Cove, approximately south of Tavani. The Ferguson River empties into the bay opposite Bibby Island.
Document 3: Salloomt River: The Salloomt River is a river in the Bella Coola Valley of the Central Coast region of British Columbia, Canada. It is a tributary of the Bella Coola River, flowing southwest out of the southernmost Kitimat Ranges to meet that river just upstream from the community of Hagensborg.
Document 4: Cann River: The Cann River rises southwest of Granite Mountain in remote country on the eastern boundary of the Errinundra National Park and flows generally east, then south, then east, then south through the western edge of the Coopracambra National Park and through the Croajingolong National Park, joined by seventeen minor tributaries before reaching its mouth with Bass Strait, at the Tamboon Inlet in the Shire of East Gippsland. The river descends over its course.
Document 5: Salmonberry River: The Salmonberry River is a tributary of the Nehalem River, about long, in northwest Oregon in the United States. It drains a remote unpopulated area of the Northern Oregon Coast Range in the Tillamook State Forest about west-northwest of Portland. The river runs through part of the region devastated between 1933 and 1951 by a series of wildfires known as the Tillamook Burn.
Document 6: Columbia Gorge AVA: The Columbia Gorge AVA is an American Viticultural Area which includes land surrounding the Columbia River Gorge, straddling the border between Oregon and Washington. Due to the significant gradations of climate and geography found in the gorge, this AVA exhibits a wide range of terroir in a relatively small region; it is marketed as a "world of wine in 40 miles".
Document 7: Oregon: Oregon (/ ˈɔːrɪɡən / (listen)) is a state in the Pacific Northwest region on the West coast of the United States. The Columbia River delineates much of Oregon's northern boundary along Washington state, while the Snake River delineates much of its eastern boundary along Idaho. The parallel 42 ° north delineates the southern boundary with California and Nevada. Oregon is one of only three states of the contiguous United States to have a coastline on the Pacific Ocean.
Document 8: Sweet Home Valley: The Sweet Home Valley of the South Santiam River runs from an area known as The Narrows near the western edge of the city of Sweet Home, Oregon to the confluence of the South Santiam and Middle Santiam rivers at Foster Reservoir on the east. Extending on either side of the South Santiam, nearly all of the valley south of the river is inside the city of Sweet Home while the valley north of the river remains unincorporated. Prior to the construction of Foster Dam, the area inundated by Foster Reservoir was occupied by several ranches and farms.
Document 9: Columbia Bar: The Columbia Bar, also frequently called the Columbia River Bar, is a system of bars and shoals at the mouth of the Columbia River spanning the U.S. states of Oregon and Washington. The bar is about 3 miles (5 km) wide and 6 miles (10 km) long.
Document 10: Sustut River: The Sustut River is a major tributary of the Skeena River in the north-central Interior of British Columbia, Canada. It forms the northwest boundary of the Hogem Ranges and flows southwest to meet the Skeena, north of Hazelton. Originally named the Bear Wallow River, its headwaters are at Sustut Lake, northwest of Germansen Landing (at ; Sustut Lake was similarly named Bear Wallow Lake).
Document 11: Bridge of the Gods (land bridge): The Bridge of the Gods was a natural dam created by the Bonneville Slide, a major landslide that dammed the Columbia River near present-day Cascade Locks, Oregon in the Pacific Northwest of the United States. The river eventually breached the bridge and washed much of it away, but the event is remembered in local legends of the Native Americans as the "Bridge of the Gods".
Document 12: Columbia Island (District of Columbia): Columbia Island is an island located in the Potomac River in Washington, D.C., in the United States. It formed naturally as an extension of Analostan Island in the latter part of the 1800s, and over time erosion and flooding severed it from Analostan. The U.S. federal government deposited material dredged from the Potomac River on the island between 1911 and 1922, and again from 1925 to 1927. The island was also reshaped by the government at this time. It received the name "Columbia Island" about 1918. In 1968, the island was renamed Lady Bird Johnson Park. Located within the park are the Lyndon Baines Johnson Memorial Grove, Navy – Merchant Marine Memorial, and the Columbia Island Marina. The island, park, memorials, and marina are part of the George Washington Memorial Parkway and administered by the National Park Service.
Document 13: Naselle, Washington: Naselle is a census-designated place (CDP) in Pacific County, Washington, United States. The population was 419 at the 2010 census. Though very near Columbia River's estuary, the valley's Naselle River flows west into nearby Willapa Bay and then into the Pacific Ocean. Close about the town lie the evergreen-covered Willapa Hills. The river's name has been spelled Nasel and Nasal. An early settler along the river called it the Kenebec. The name comes from the Nisal Indians, a Chinookan tribe formerly residing on the river.
Document 14: Nehalem Bay: Nehalem Bay is a bay formed by the confluence of the Nehalem River with the Pacific Ocean in northern Oregon, United States.
Document 15: Northport Bridge: The Northport Bridge spans the Columbia River near Northport, Washington, close to the border with Canada. The steel cantilever through-truss bridge replaced an 1897 timber bridge, and was opened in 1951. It carries Washington State Route 25. It is one of a series of similar bridges built at about the same time, including the Grand Coulee Bridge and the Kettle Falls Bridges.
ground_truth: Columbia Bar
sub_queries: What does Salmonberry River flow into? Answer: Nehalem River
Nehalem River >> mouth of the watercourse Answer: Pacific Ocean
where does the columbia river meet Pacific Ocean Answer: Columbia Bar