  We show that a Bose-condensed gas under extreme rotation in a 2D anisotropic
trap, forms a novel elongated quantum fluid which has a roton-maxon excitation
spectrum. For a sufficiently large interaction strength, the roton energy
reaches zero and the system undergoes a second order quantum transition to the
state with a periodic structure - rows of vortices. The number of rows
increases with the interaction, and the vortices eventually form a triangular
Abrikosov lattice.
