Here is a map of Hannibal's route thru Spain although it probably is speculation, biased by a presumption that coastal lowlands aren't as rugged as they are. Then a topographic map showing inland Cordoba is indeed on a river valley coming close in the east to another river snaking east thru mountains. But again those valleys may be really rugged. So IMHO even if 100 elephants were led thru and occasionally died in Spain it seems unlikely to find any ancient death site vs souvenir pieces spread far and wide.