Lake Rotorua
Bay of Plenty
Lake Rotorua, located in New Zealand's Bay of Plenty region, is the second largest lake on the North Island by surface area, covering approximately 79.8 square kilometers. It occupies the Rotorua Caldera, a volcanic crater formed about 240,000 years ago after a major eruption and subsequent collapse of the magma chamber beneath. The lake is relatively shallow, with a mean depth of just 10 meters, and features a distinctive yellowish-green hue due to its high sulphur content from surrounding geothermal activity, including geysers and hot mud pools. Several rivers and streams feed into the lake, some carrying warm water influenced by thermal activity, while others provide clear, cool water. Mokoia Island, situated near the lake’s center, is a rhyolite dome known for its cultural significance in Māori legend, particularly the story of Hinemoa and Tutanekai. The lake flows into Lake Rotoiti via the Ohau Channel and is bordered by the city of Rotorua on its southern shore. Despite its popularity for trout fishing, the lake's shallow depth and sediment inflows reduce its suitability for swimming and watersports. Environmental challenges include nutrient pollution from surrounding farming activities, leading to algal blooms and invasive aquatic plants, which local authorities actively manage through various restoration efforts.
ヒント: The best time to visit Lake Rotorua is during the warmer months when the weather is stable and the water conditions are clearer for fishing and sightseeing. Visitors interested in Māori culture should explore the legends associated with Mokoia Island. It is advisable to check local environmental conditions and any advisories before engaging in water activities, and to consider guided tours for a richer cultural and geological experience. Advance booking for guided tours around the lake and nearby geothermal attractions is recommended, especially during peak tourist seasons. Discounts may be available for combined tours or group visits.
興味深い事実
- •Lake Rotorua is the second largest lake by surface area on New Zealand’s North Island, covering nearly 80 square kilometers.
- •The lake sits within the Rotorua Caldera, a volcanic crater formed after a major eruption about 240,000 years ago.
- •Mokoia Island, located near the center of the lake, is famous for the Māori legend of Hinemoa and Tutanekai, where Hinemoa swam across the lake to reach her lover.
- •The lake’s distinctive yellowish-green water color is due to high sulphur content from geothermal activity including geysers and hot mud pools around the lake.
- •Recent mapping revealed an ancient submerged river course and thousands of pockmarks on the lake floor, indicating ongoing geothermal gas emissions.
歴史
Lake Rotorua formed within the Rotorua Caldera following a massive volcanic eruption approximately 240,000 years ago, which caused the collapse of the magma chamber and created the crater that now holds the lake.
Over millennia, volcanic activity and geological subsidence have influenced the lake's water levels and surrounding landscape.
Notably, the Ngongotahā Dome and Mokoia Island are volcanic features formed after the caldera’s creation.
The lake’s ecosystem and water quality have been affected in recent decades by human activities, particularly livestock farming, which has introduced significant nitrogen pollution.
Restoration efforts to improve water quality have been ongoing since the mid-20th century.
場所ガイド
Mokoia IslandPost-240,000 years ago
A rhyolite volcanic dome near the center of Lake Rotorua, Mokoia Island is culturally significant and linked to the Māori legend of Hinemoa and Tutanekai. It is accessible by boat tours and offers insights into Māori heritage and natural beauty.
Rotorua Caldera~240,000 years ago
The volcanic crater that forms the basin of Lake Rotorua, created by a massive eruption and magma chamber collapse about 240,000 years ago. It is part of the Taupō Volcanic Zone, a geothermally active region.