It's a mystery.
The same place as when I hold a coffee cup to my ear..
All I hear is my computer fan, which I hear all the time anyway.
That's better than hearing ringing..
Phoenix, AZ is a city in the desert, which means the weather is seldom predictable. In winter the temperature might go down to 20F or it might not. In 1993 the temp never went low enough to kill the mold in the grass, so the following summer there were bazillions of infections. I had a fever and I slept for five days straight. My ears have been ringing ever since.
Damn that's a long time of sleeping.
It's very annoying to put up with it, that's for sure.
There is a popular folk myth that if one holds a seashell—specifically, most often, a conch shell—to one's ear, one can hear the sound of the ocean. The rushing sound that one hears is in fact the noise of the surrounding environment, resonating within the cavity of the shell.