Tashirojima
It's an island where they use cats as a substitute for rice! Lovely Tashirojima. Don't worry, they don't eat them! ...or, wait, do they?
たしろじま
This is a place name and it uses the kun'yomi. You haven't learned this particular kun'yomi for 代 yet, so here's a mnemonic to help you remember it:
When you go to Tashirojima, make sure you visit the old woman. You know what woman I'm talking about, the one who starred on Murder she wrote (しろ). She writes a lot about cats now, I guess.
田代島の人口は百人以下です。
The population of Tashirojima is less than one hundred.
田代島にはガソリンスタンドがありません。
There are no gas stations on Tashirojima.
最も有名な「猫島」といえば、日本の宮城県にある田代島という島です。
The most famous "cat island" is the island Tashirojima in Japan's Miyagi prefecture.