city, Shizuoka ken (prefecture), Honshu, Japan. It lies on the northeastern coast of the Izu Peninsula, facing Sagami Gulf of the Pacific Ocean. The city occupies the crater of the extinct volcano Mount Atami. The surrounding hills are remnants of the crater wall, which has been drowned by the sea on the east. Atami's mild and warm climate, scenic seascape, and hot springs have made it a favoured resort since the 5th century AD. Development of the city and its surrounding region as a recreational area was rapid after 1934, when the opening of Tanna Tunnel brought the Tokaido Line (railway) to the city. Overconstruction on mountainous land has caused landslides and traffic problems.
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