What is the bingle bog and why is it chosen as he venue to create the atmosphere for the story?

bingle bog is an imaginary marsh and muddy area in which the sumac tree is situated . the Word bingle bog is an alliteration thus giving the poem a nursery rhyme like/fable like effect.it ia chose as a venue to create an atmosphere for a story as it consists of a variety of habitats and houses many different kinds of creatures eg-ducks frogs herons teals