Bodies of water of Japan

Matsuo Pond (松尾池, Matsuo-ike) is a pond in Gifu, Gifu Prefecture, Japan. It is located at the southern base of Mount Dodo, the city's tallest mountain. The area around the lake is known as the Hagi Falls Nature Park (萩の滝自然公園 Hagi-no-taki Shizen Kōen). The park is very popular in the fall when the leaves are changing color.

Oguni-numa Pond (Japanese Kanji: 雄国沼; Japanese Hiragana: おぐにぬま) is a pond located at the western base of Mount Nekomadake in Fukushima Prefecture, Japan. The pond is situated on the remains of a crater and has a circumference of 4 km and an area of 45 hectares. The wetland flora of the pond is a nationally designated natural monument.

The Naruto whirlpools (鳴門の渦潮, Naruto no Uzushio) are tidal whirlpools in the Naruto Strait, a channel between Naruto in Tokushima and Awaji Island in Hyōgo, Japan. The strait between Naruto and Awaji island has a width of about 1.3 km (0.81 miles). The strait is one of the connections between the Pacific Ocean and the Inland Sea, a body of water separating Honshū and Shikoku, two of the main islands of Japan. The tide moves large amounts of water into and out of the Inland Sea twice a day. With a range of up to 1.7 m (5.6 ft), the tide creates a difference in the water level of up to 1.5 m (4 ft 11 in) between the Inland Sea and the Pacific. Due to the narrowness of the strait, the water rushes through the Naruto channel at a speed of about 13–15 km/h (8–9 mph) four times a day, twice flowing in and twice flowing out. During a spring tide, the speed of the water may reach 20 km/h (12 mph), creating vortices up to 20 m (66 ft) in diameter.

The Uraga Channel (浦賀水道, Uraga-suidō) is a waterway connecting Tokyo Bay to the Sagami Gulf. It is an important channel for ships headed from Tokyo, Yokohama, and Chiba to the Pacific Ocean and beyond.

Ōike (大池) is a karst pond on Minamidaitōjima, Okinawa Prefecture, Japan. Ōike is the largest pond containing both freshwater and seawater. It covers 0.31 square kilometres (0.12 sq mi), the circumference is 5.50 kilometres (3.42 mi), and it is 1.3 metres (4 ft 3 in) at its deepest point. Fresh water is mixed with seawater beneath.