Ata (may Allah have mercy on him) narrates from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the place of slaughter is in fact Makkah, but it has been kept clean of blood; and Sayyiduna Ibn Abbas (may Allah be pleased with them both) says that Makkah too is part of Mina.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10231