title: Plymouth
paragraph_text: The settlement of Plympton, further up the River Plym than the current Plymouth, was also an early trading port, but the river silted up in the early 11th century and forced the mariners and merchants to settle at the current day Barbican near the river mouth. At the time this village was called Sutton, meaning south town in Old English. The name Plym Mouth, meaning "mouth of the River Plym" was first mentioned in a Pipe Roll of 1211. The name Plymouth first officially replaced Sutton in a charter of King Henry VI in 1440. See Plympton for the derivation of the name Plym.
title: Bumping River
paragraph_text: The Bumping River is a tributary of the Naches River, in Washington in the United States. It flows down the east side of the Cascade Range, through Wenatchee National Forest and the William O. Douglas Wilderness. From its source at Fish Lake near Crag Mountain, it flows northeast to Bumping Lake, a natural lake enlarged and regulated by Bumping Lake Dam. Below the dam, the Bumping River continues flowing northeast. It is joined by the American River, its main tributary, a few miles above its mouth where it joins the Little Naches River to form the Naches River.
title: Lansdowne River
paragraph_text: Lansdowne River, a watercourse of the Manning River catchment, is located in the Mid North Coast district of New South Wales, Australia.
title: Wolli Creek
paragraph_text: Wolli Creek () is an urban watercourse of the Cooks River catchment located in the southern suburbs of Sydney, in New South Wales, Australia.
title: Doubtful Creek
paragraph_text: Doubtful Creek, formerly known as Doubtful River, a watercourse that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Snowy Mountains district of New South Wales, Australia.
title: Arado River
paragraph_text: Arado (plow) River in the north of Portugal. The river's source is the Gerês Mountain, and the mouth cascades into the Fafião river, (41°42'10.88"N; 8° 6'33.50"W), Fafião place, Cabril village, Montalegre municipality. From Arado cascate (41°43'25.53"N; 8° 7'46.98"W) till the mouth, runs .
title: Little Yoho River
paragraph_text: The Little Yoho River is a short river in British Columbia that flows east from Kiwetinok Lake, which is the highest named lake in Canada, and into the Yoho River about upstream from the mouth of the creek that Takakkaw Falls is on. It is probably best known for Laughing Falls, an impressive plunge just above the river’s mouth that is seen on the way to Twin Falls.
title: Bardwell Creek
paragraph_text: Bardwell Creek, an urban watercourse of the Cooks River catchment, is located in the southern suburbs of Sydney, in New South Wales, Australia.
title: Lake Kyyjärvi
paragraph_text: Lake Kyyjärvi is a medium-sized lake in Finland. It is a starting point of the Saarijärvi Whitewater Route, a continuous watercourse in Central Finland.
title: Maryland River
paragraph_text: Maryland River is a watercourse of the Clarence River catchment in the Northern Tablelands district of New South Wales, Australia. Its upper reaches run close to the border between New South Wales and Queensland.
title: Rinža
paragraph_text: The Rinža (German: Rinse, Rinnse) is a river of Slovenia. It is long and flows through Kočevje. It is the main watercourse of the Kočevje Polje and it is a losing stream. A few kilometers downstream of Kočevje, it goes subterranean. It emerges again as the Bilpa, a tributary of the Kolpa.
title: Toongabbie Creek
paragraph_text: Toongabbie Creek, an urban watercourse that is part of the Parramatta River catchment, is located in Greater Western Sydney, New South Wales, Australia.
title: Naches River
paragraph_text: The Naches River is a tributary of the Yakima River in central Washington in the United States. Beginning as the Little Naches River, it is about 75 miles (121 km) long. After the confluence of the Little Naches and Bumping River the name becomes simply the Naches River. The Naches and its tributaries drain a portion of the eastern side of the Cascade Range, east of Mount Rainier and northeast of Mount Adams. In terms of discharge, the Naches River is the largest tributary of the Yakima River.
title: Swift River (Teslin Lake)
paragraph_text: The Swift River is a river that begins in Yukon Territory and flows southwest into British Columbia to its mouth at the east side of Teslin Lake on the Teslin River system. The river drains the uppermost portion of the Cassiar Mountains and in its lower reaches traverses the Nisutlin Plateau, which lies along the east side of Teslin Lake north of the mouth of the Jennings River, which is to the south of the Swift.
title: Coxs Creek (Belfield, New South Wales)
paragraph_text: Coxs Creek, a watercourse of the Cooks River catchment, is located in the Inner West of Sydney, in New South Wales, Australia.
title: Cabramatta Creek
paragraph_text: Cabramatta Creek, an urban watercourse of the Georges River catchment, is located in the south-western region of Sydney, in New South Wales, Australia.
title: Darling Mills Creek
paragraph_text: The Darling Mills Creek, an urban watercourse that is part of the Parramatta River catchment, is located in Greater Western Sydney, New South Wales, Australia.
title: Visherka River
paragraph_text: Visherka River () is a river in Perm Krai, Russia, a right tributary of the Kolva River. It is long, and its drainage basin covers . It flows out of lake Chusovskoe in the north of the Cherdynsky District near its border with the Komi Republic. Its mouth is upstream of the uninhabited village of Bogatyryovo, from the mouth of the Kolva River. Its most significant tributaries are:
title: Cup and Saucer Creek
paragraph_text: Cup and Saucer Creek, an urban watercourse of the Cooks River catchment, is located in the Canterbury-Bankstown region of Sydney, in New South Wales, Australia.
title: Little River (Wingecarribee)
paragraph_text: The Little River, a watercourse that is part of the Hawkesbury-Nepean catchment, is located in the Southern Highlands region of New South Wales, Australia.

Question: What is the mouth of the river which serves as the mouth of the Bumping River?

Question decomposition:
question: Bumping River >> mouth of the watercourse
answer: Naches River
question: #1 >> mouth of the watercourse
answer: Yakima River

Answer: Yakima River