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To see "sea of clouds"-Unkai(雲海) at Oe Mountain(大江山), usually chances are big in Autumn to early winter.
This is unofficial tourist information of the north part of Kyoto prefecture(TANGO)!! If you interesting to see countryside or seaside of Japan, why not visit TANGO along with your Kyoto city trip?(2hrs from Kyoto station by direct bus or train) TANGO is a traditionally popular tourist destination among Japanese.