The circulation driven by buoyancy and mesoscale eddy effects in the Atlantic layer of the Canada Basin is obtained diagnostically from a climatological density field. The buoyancy forcing is caused by the divergence of diapycnal flow. The diapycnal flow is estimated from a density balance between the diapycnal advection and diffusion based on the density field. On the other hand, the eddy forcing is formulated as the curl of vertical friction. The vertical friction is estimated from geostrophic shear, which is obtained from the density field. Both the flow fields caused by the buoyancy forcing and by the eddy forcing similarly suggest a new flow structure characterized by a transbasin westward flow, which appears from the eastern central basin to the southwestern basin. The transbasin westward flow is also shown in geostrophic circulation at 500 m relative to reference levels in a wide range (1000--3000 m). The significant part of the flow is consistent with a temperature distribution at 500 m.