Question: What ocean is home of the Hawaiian-Emperor seamount chain and Kure Atoll?
Context: Nintoku Seamount or Nintoku Guyot is a seamount (underwater volcano) and guyot (flat top) in the Hawaiian-Emperor seamount chain.  It is a large, irregularly shaped volcano that last erupted 66 million years ago.  Three lava flows have been sampled at Nintoku Seamount; the flows are almost all alkalic (subaerial) lava.  It is 56.2 million years old. Koko Guyot (also sometimes known as "Kinmei" and Koko Seamount) is a 48.1-million-year-old guyot, a type of underwater volcano with a flat top, which lies near the southern end of the Emperor seamounts, about 200 km north of the "bend" in the volcanic Hawaiian-Emperor seamount chain.  Pillow lava has been sampled on the north west flank of Koko Seamount, and the oldest dated lava is 40 million years old.  Seismic studies indicate that it is built on a 9 km thick portion of the Pacific Plate.  The oldest rock from the north side of Koko Seamount is dated at 52.6 and the south side of Koko at 50.4 million years ago.  To the southeast of the bend is Kimmei Seamount at 47.9 million years ago and southeast of it, Daikakuji at 46.7. Lōʻihi Seamount (also known as Loihi) is an active submarine volcano about 35 km off the southeast coast of the island of Hawaiʻi.  The top of the seamount is about 975 m below sea level.  This seamount is on the flank of Mauna Loa, the largest shield volcano on Earth.  Lōʻihi, meaning "long" in Hawaiian, is the newest volcano in the Hawaiian-Emperor seamount chain, a string of volcanoes that stretches over 5800 km northwest of Lōʻihi.  Unlike most active volcanoes in the Pacific Ocean that make up the active plate margins on the Pacific Ring of Fire, Lōʻihi and the other volcanoes of the Hawaiian-Emperor seamount chain are hotspot volcanoes and formed well away from the nearest plate boundary.  Volcanoes in the Hawaiian Islands arise from the Hawaiʻi hotspot, and as the youngest volcano in the chain, Lōʻihi is the only Hawaiian volcano in the deep submarine preshield stage of development. Kure Atoll (呉ヶ島 , Kure-gashima ) ( ; Hawaiian: "Mokupāpapa" ) or Ocean Island is an atoll in the Pacific Ocean 48 nmi beyond Midway Atoll in the Northwestern Hawaiian Islands at .  The only land of significant size is called Green Island and is habitat for hundreds of thousands of seabirds.  A short, unused and unmaintained runway and a portion of one building, both from a former United States Coast Guard LORAN station, are located on the island.  Politically it is part of Hawaii, although separated from the rest of the state by Midway, which is a separate unorganized territory. Hancock Seamount is a seamount of the Hawaiian-Emperor seamount chain in the Pacific Ocean. The Hawaiian–Emperor seamount chain is a mostly undersea mountain range in the Pacific Ocean that reaches above sea level in Hawaii.  It is composed of the Hawaiian ridge, consisting of the islands of the Hawaiian chain northwest to Kure Atoll, and the Emperor Seamounts: together they form a vast underwater mountain region of islands and intervening seamounts, atolls, shallows, banks and reefs along a line trending southeast to northwest beneath the northern Pacific Ocean.  The seamount chain, containing over 80 identified undersea volcanoes, stretches over 5800 km from the Aleutian Trench in the far northwest Pacific to the Loʻihi seamount, the youngest volcano in the chain, which lies about 35 km southeast of the Island of Hawaiʻi. Abbott Seamount is a seamount lying within the Hawaiian-Emperor seamount chain in the northern Pacific Ocean.  It erupted 36-40 million years ago. Meiji Seamount, named after Emperor Meiji, the 122nd Emperor of Japan, is the oldest seamount in the Hawaiian-Emperor seamount chain, with an estimated age of 82 million years.  It lies at the northernmost end of the chain, and is perched at the outer slope of the Kuril-Kamchatka Trench.  Like the rest of the Emperor seamounts, it was formed by the Hawaii hotspot volcanism, grew to become an island, and has since subsided to below sea level, all while being carried first north and now northwest by the motion of the Pacific Plate.  Meiji Seamount is thus an example of a particular type of seamount known as a guyot, and some publications refer to it as Meiji Guyot. Kanmu Seamount is a seamount lying within the Hawaiian-Emperor seamount chain in the Pacific Ocean.  The last eruption of Kanmu Seamount is unknown. Detroit Seamount, which was formed around 76 million years ago, is one of the oldest seamounts of the Hawaiian-Emperor seamount chain (Meiji Seamount is the oldest, at 82 million years).  It lies near the northernmost end of the chain and is south of Aleutian Islands (near Russia), at It is a seamount in the chain, located north of the hinge of the "V" in the image at right.
Answer: the Pacific Ocean