A sealed and insulating vessel for the storage of a fluid, the said vessel comprising a plurality of walls (3, 4), each wall having in succession, through the thickness of the wall of the vessel from the outside to the inside of the vessel, an outer load-bearing structure, a thermally insulating barrier attached to the load-bearing structure and a sealing membrane supported by the said thermally insulating barrier, the said thermally insulating barrier comprising: - a plurality of lagging elements located along the walls of the vessel, arranged so as to define passages for the flow of gas within the said thermally insulating barrier; and - a corner arrangement located at the intersection between the first and the second walls (3, 4) of the vessel, the said vessel being characterized in that the corner arrangement comprises: - a deflection element (19, 45, 46) having a first surface opposite to the load-bearing structure of the second wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the first wall, a second surface opposite the load-bearing structure of the first wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the second wall and a plurality of elbow channels (21, 47, 50) extending between the first surface and the second surface of the deflection element (19, 45, 46) to allow fluid to flow across the corner arrangement, the plurality of elbow channels (21, 47, 50) comprising at least one set of elbow channels spaced apart from each other through the thickness of the first and second walls (3, 4) of the vessel. - a plurality of lagging elements located along the walls of the vessel, arranged so as to define passages for the flow of gas within the said thermally insulating barrier; and - a corner arrangement located at the intersection between the first and the second walls (3, 4) of the vessel, the said vessel being characterized in that the corner arrangement comprises: - a deflection element (19, 45, 46) having a first surface opposite to the load-bearing structure of the second wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the first wall, a second surface opposite the load-bearing structure of the first wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the second wall and a plurality of elbow channels (21, 47, 50) extending between the first surface and the second surface of the deflection element (19, 45, 46) to allow fluid to flow across the corner arrangement, the plurality of elbow channels (21, 47, 50) comprising at least one set of elbow channels spaced apart from each other through the thickness of the first and second walls (3, 4) of the vessel. - a deflection element (19, 45, 46) having a first surface opposite to the load-bearing structure of the second wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the first wall, a second surface opposite the load-bearing structure of the first wall and communicating with one or more of the passages for the flow of fluid defined by the plurality of lagging elements located along the second wall and a plurality of elbow channels (21, 47, 50) extending between the first surface and the second surface of the deflection element (19, 45, 46) to allow fluid to flow across the corner arrangement, the plurality of elbow channels (21, 47, 50) comprising at least one set of elbow channels spaced apart from each other through the thickness of the first and second walls (3, 4) of the vessel.