I got a dream: Big wave came from the up stream

Dear readers, I just got this weirdest dream ever! Without any of the sign suddenly a big wave came from the up stream toward to the ocean and clear everything in it path. The story begin where I go to this an unknown longhouse for a vacation. A very quite, peaceful and mind blowing found in the middle of the jungle where water transport is the main transportation there. The longhouse just next to the stream so I sit there and enjoy the scenery.