Natural Wonder Blue Pond yana gefen hagu na Kogin Bieigawa, kudu maso gabashin Biei City a Hokkaido, Japan, kimanin kilomita 2,5 arewa maso yammacin Platinum Hot Springs a gindin Dutsen Tokachi. Tafkin ya sami sunansa saboda launin ruwan shuɗi mai haske wanda bai dace ba. A hade tare da kututturen da ke fitowa sama da saman ruwa, Blue Pond yana da kyan gani.
Tafkin shudi ya bayyana akan wannan wuri ba da dadewa ba. Wannan tafki ce ta wucin gadi, kuma an kafa ta ne lokacin da aka kafa madatsar ruwa don kare yankin daga kwararowar laka da ke zamewa a kan tsaunin Tokachi. Bayan fashewa a watan Disamba 1988, Hukumar Raya Yankin Hokkaido ta yanke shawarar gina dam a mashigar ruwan kogin Bieigawa. Yanzu haka ruwan da dam din ya rufe, ana tattara shi a cikin dajin, inda aka kafa tafki mai ruwan budadi.
Launi mai launin shuɗi na ruwa gaba ɗaya ba zai yiwu ba. Mafi mahimmanci, kasancewar aluminium hydroxide a cikin ruwa yana ba da gudummawa ga haskaka bakan haske mai shuɗi, kamar yadda yake faruwa a yanayin duniya. Launin tafki yana canzawa da rana har ma ya dogara da kusurwar da mutum ya kalli shi. Ko da yake ruwan ya yi kama da shuɗi daga bakin tekun, a zahiri a fili yake.
Garin Biei mai ban sha'awa ya kasance sanannen wurin yawon bude ido tsawon shekaru, amma Tafkin Blue ya sanya shi zama cibiyar kulawa, musamman bayan Apple ya hada hoton tafkin ruwa a cikin OS X Mountain Lion da aka saki kwanan nan.