The Philippine Island of Luzon has a lake. The lake contains an island. This island contains a lake, and this lake contains another island. wow!
Luzon is located in the northernmost region of the archipelago, and is also the name for one of the three primary island groups in the country centered on the Island of Luzon (the other two being the Visayas and Mindanao). Luzon as an island group includes the island of Luzon itself.