function region = p23_region ( )

%*****************************************************************************80
%
%% P23_REGION returns the name of the integration region for problem 23.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    18 March 2007
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, string REGION, the name of the integration region.
%
  region = 'simplex';

  return
end