We will study valuations on an excellent Noetherian local domain R which are such that the inclusion R \subset R_v in the valuation induces a trivial residue field extension with the rational rank of the value group equal to the dimension of R. Assuming that the residue field R/m is algebraically closed we will give an overview of their local uniformization and stress the fact that not only are they quasi-monomial, but they are toroidal in nature: the valuation ring is the limit of a nested system of birational toric maps between regular local rings.