  We consider a black hole solution whose spatial boundary is a squashed three
sphere in Einstein gravity with negative cosmological constant. We solve the
Einstein equations numerically and find a warped AdS black hole solution with
arbitrary squashing parameter. This solution becomes the ordinary
AdS-Schwarzschild solution when the squashing parameter is chosen
appropriately. Motivated by this fact, we study N=4 super Yang-Mills theory
with zero coupling constant on a squashed three sphere and show that the
thermodynamical entropy of this theory roughly agrees with that of the warped
AdS black hole up to a factor of 3/4. We also study the
confinement/deconfinement transition of the gauge theory. We evaluate the
approximate Hawking-Page transition temperature of the warped AdS black hole
and find a qualitative agreement between the transition temperatures of the
gravity and the gauge theory. These results suggest a duality between the
warped AdS solution and N=4 super Yang-Mills theory on a squashed three sphere.
