According to the blog below, it is about 144kg of rice.
http://blog.naver.com/2000happy_/220726713936
Rice Counting Unit: Island
★ Island is not a unit of weight, but a unit of volume ★
Rice 1 Island: Approximately 180 L (liter) = 144 kg
1 island of rice: about 200 kg (about 144 kg when milled) = about 10 horses
1 bag of rice = about 4 rolls = about 80 kg
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