大山上池・下池, Freshwater ponds in Tsuruoka, Japan
Oyama Kamiike and Shimoike are two connected ponds located in the western area of Tsuruoka City. The upper pond covers roughly 15 hectares while the lower one spans approximately 24 hectares.
These irrigation ponds were created roughly 400 years ago and appear documented on historical maps from the 1600s onward. They were built to support agricultural water needs across the region.
The name refers to the upper and lower ponds that have been woven into the region's identity for centuries. Local groups still perform traditional practices here, such as harvesting lotus flowers for Buddhist altar decorations during summer festivals.
These ponds are accessible by foot or car from nearby transportation points. The Uzen-Oyama Station on the Uetsu Main Line works well for walking visitors, while National Route 112 near Sennenji Temple provides a convenient driving option.
The wetland attracts tens of thousands of waterfowl annually, including mallards and whooper swans, particularly during winter months. These bird visitors make the site a crucial stopover point for migrating species on their yearly journeys.
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