Upon a given landmass I drew a lake, and surrounded it with small ranges of mountains and plateaux, so making it an enormous endorheic basin. The drainage from the highlands would collect upon this immense lowland amidst them and form a body of water nearly twice as large as the Caspian Sea, though many of the mountains would also serve as sources for impluviums for rivers which would flow in the opposite direction of the lake, running into the landmass, then the ocean.
The reason I wanted to create this lake was so it could be at the centre of several civilizations and societies, who would rely on its water and the mineral resources from its mountains and the outward flowing rivers originating in them. The lake would also serve as a hub of trade and diplomacy, though the mountainous nature of its bounds would make these endeavours less eminent than they would have been in flatter terrain.
Would it be geologically feasible for this lake and highlands to form, and would there be any grave consequences to the development of large human communities around it?