According to Darjeeling is a small resort town with an elevation of 6500 feet above sea level. (http://www.stashtea.com/w-111191.htm) It goes on to say that "Darjeeling teas are considered the finest, rarest and most prestigious of black teas. The taste of Darjeeling varies with the seasons or harvest periods."

The Darjeeling tea I've typically had is a light golden colored tea that's somewhere between green tea and the more traditional black teas. I think that most of the Darjeeling tea sold in the US is the "second flush" or summertime harvest variety of Darjeeling.