Are There Islands Near Mount Aconcagua? No—It's an Inland Andean Peak

No. Aconcagua (6,961 m) rises in the Andes on the Argentina–Chile border, ~100 km from the Pacific coast. The nearest islands are the Chilean archipelagos far to the south (Chiloé, Wellington) or the Falklands—hundreds of kilometers away. No islands are "in relation to" the mountain.