There's an island

[Goshute]

in a lake, which is inside an island, within a larger lake, which is on the island of Luzon, Philippines.

But you already knew that, right? I didn't until yesterday. Zoom out.

[StuartR]

I had heard of it, but never seen the image before, thank you for sharing

[Bigaldoc]

No, I had never heard of this one. Interesting geography lesson.

[ChrisGreaves]

...But you already knew that, right? I didn't until yesterday. Zoom out.

Yup
Wikepedia

"Manitoulin Island is a Canadian island in Lake Huron, in the province of Ontario. It is the largest island in a freshwater lake in the world"

"Lake Manitou (about 104 km2 - 40.5 sq. mi.) is the largest lake in a freshwater island in the world,[3] and Treasure Island in Lake Mindemoya is the largest island in a lake on an island in a lake in the world."

etc. etc. etc.
Once you have "The largest of " anything, a great many things about it will be the most extreme example of ... in the largest of anything.
It's a sort-of self-serving filter, I think.