Dragon's Valley is a recurring location throughout the Cookie Run franchise with it being the center point of most events with Cookies related to the element of fire, the most notable examples being 
Mala Sauce Cookie, 
Fire Spirit Cookie, and 
Pitaya Dragon Cookie.
It is the location of Pitaya Dragon Cookie's nest, and is near Dragon City and the Mala Tribe's village. Scovillia is presumed to be near the Dragon's Valley as well.