  A representation of the static MHD equilibrium system in coordinates
connected with magnetic surfaces is suggested. It is used for producing
families of non-trivial 3D exact solutions of isotropic and anisotropic plasma
equilibria in different geometries, with and without dynamics, and often
without geometrical symmetries. The ways of finding coordinates in which exact
equilibria can be constructed are discussed; examples and their applications as
physical models are presented.
