We present here bijections between the regions of certain Type B, C, D Coxeter arrangements and certain configurations of trees. These bijections further allow us to obtain generating functions for the number of regions.

An n-dimensional real hyperplane arrangement is a finite collection of affine hyperplanesin R^n. A given arrangement separates R^n into disjoint regions and it is an important problem

The present work originates from an effort to generalise previously known methods andresults in Type A arrangements due to my advisor Olivier Bernardi in his previous work.

in combinatorics to understand these regions combinatorially, in particular to enumerate the

It should also serve as a starting point in developing a systematic bijective framework for

studying the combinatorics of general Coxeter arrangements.

number of regions associated to an arrangement.