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Devils Kettle, Air Terjun Misterius tanpa Muara Air Terjun Devil's Kettle merupakan fenomena geologi membingungkan yang terletak di Judge CR Magney State Park, Minnesota, Amerika Serikat, tepatnya di lepas pantai Danau Superior. Air terjun ini berasal dari hulu Sungai Brule yang mengalir di ketinggian 800 kaki dan menciptakan banyak anak air terjun. Salah satu anak air terjun tersebut adalah Devil's Kettle. Anehnya, air terjun yang satu ini tidak ada muaranya. Aliran airnya terbelah dua dan salah satunya masuk ke sebuah lubang yang tercipta di sisi tonjolan batu. Bagian timur air terjun ini setinggi 50 meter memang mengalir ke bawah dan terus menuju Danau Superior. Namun, bagian baratnya setinggi 10 kaki justru masuk ke lubang raksasa Devil's Kettle dan menghilang begitu saja. Tidak ada yang tahu kemudian kemana air ini mengalirnya.
Dilansir dariAmusing Planet, peneliti percaya bahwa ada jalur keluar disatu tempat di bawah Danau Superior, namun tidak ada yang berhasil menelitinya. Selama bertahun-tahun, para peneliti telah menjatuhkan benda-benda bewarna ke dalam lubang raksasa tersebut, bola ping pong, dan benda-benda lainnya. Namun, benda-benda tersebut sejauh ini tak pernah ditemukan mengalir di sekitar sungai atau pun di danau. Satu teori mengatakan bahwa ada sebuah sungai mengalir di bawah tanah dan keluar di suatu tempat di Danau Superior. Namun, hipotesis ini dirasa mustahil ada sungai di bawah danau. Teori lain mengatakan jutaan tahun lalu sebuah tabung lava padat terbentuk di bagian riolit dari Devil's Kettle. Tabung lava itu terbentuk di lapisan basalt yang mengalir menuruni goa lereng gunung berapi dan lapisan terdekatnya di Devil's Kettle. Namun, keberadaan goa bawah tanah ini juga dikesampingkan, sebab salah satu ciri keberadaan goa bawah tanah adalah adanya batuan kapur. Nah, di sekitar daerah itu tidak ada batuan kapur. Misteri ini diperparah oleh kenyataan tidak ada puing-puing mengambang bekas benda-benda yang dibuang ke dalam lubang Devil's Kettle yang mengalir ke Danau Superior. Lalu, dimanakah muara air terjun ini?