Why was the city of tenochtitlan easy to defend?

Tenochtitlan was easy to defend due to its strategic location on an island in the middle of Lake Texcoco, which provided natural barriers against invasions. Its extensive system of canals and causeways allowed for controlled access, making it difficult for enemies to launch attacks. Additionally, the city's layout included strong fortifications and a well-organized military, further enhancing its defensive capabilities.